The best running board extension brackets depend on your vehicle and the amount of additional step drop or mounting support you need. The AMP Research kit is the clearest choice for adding two inches of drop to select PowerStep kits. For fixed running board installations, the Silverado and Sierra brackets, G-PLUS F-150 brackets, HECASA ProMaster bracket, and Westin mount kit each specify different vehicle applications. Confirm the vehicle, cab style, side, and existing step system before ordering.
| Product | Best For | Key Fitment Detail |
|---|---|---|
| AMP Research Extension Arm Kit | Adding step drop to select PowerSteps | Fits five listed kit numbers |
| Auto Running Board Brackets | Specified Chevy and GMC trucks | Multiple Silverado and Sierra years |
| G-PLUS Mounting Brackets | Ford F-150 owners | 2015–2022 F-150 |
| HECASA Running Board Bracket | Ram ProMaster owners needing a passenger-side bracket | 2014–2023 ProMaster 1500, 2500, 3500 |
| Westin Mount Kit | Specified Silverado and Sierra cab configurations | Multiple 2014–2019 applications |
AMP Research PowerStep Extension Arm Kit
Best for: Owners of a compatible AMP Research PowerStep system who want the stepping surface to drop an additional two inches. This four-piece extension arm kit is designed for use with select kits rather than as a universal running board bracket.
The listed compatible kit numbers are 75101, 75118, 75143, 75104, and 75134. Its clearly stated two-inch drop makes it the most directly targeted option here for changing step reach, rather than replacing a vehicle-specific fixed-board mounting kit.
Choose this if your existing PowerStep kit number appears in the fitment list and you need the added drop. Avoid it if you have a different step system or cannot verify the kit number; the product information does not claim universal compatibility.
Chevy Silverado And GMC Sierra Brackets
Best for: Buyers seeking custom running board installation on the listed Chevy Silverado and GMC Sierra models. The fitment description covers Silverado 1500 models from 2004 to 2014 and 2500 or 3500 models from 1999 to 2015, along with corresponding listed GMC Sierra ranges.
The product information describes steel treated with an ED process and powder coating for scratch and rust resistance. It also identifies rugged construction and custom installation as design aims. These details make it a relevant choice when the vehicle falls within the specified applications and the goal is mounting a running board.
Check before buying: The broad model-year ranges do not replace confirming the exact truck configuration and bracket requirements. The supplied details do not specify cab-style fitment.
G-PLUS Ford F-150 Mounting Brackets
Best for: Ford F-150 owners with a 2015–2022 model who need running board mounting brackets. The stated vehicle-specific fitment makes this a more suitable starting point than a bracket listed for another truck make.
G-PLUS describes the brackets as made from durable materials and says they are produced with advanced manufacturing processes and quality-control measures. The listing presents them as a mounting solution, not as an arm kit that adds a specified amount of step drop.
Choose this if your F-150 year matches the listing and you need mounting brackets. Confirm the details before ordering if your truck has a particular cab or running-board configuration, since those details are not included in the supplied product information.
HECASA Ram ProMaster Passenger-Side Bracket
Best for: Owners of a 2014–2023 Ram ProMaster 1500, 2500, or 3500 looking for a passenger-side side-step or grip-step mounting bracket. The stated side and vehicle range help distinguish this option from full mounting kits or extension arms.
The listing identifies this as a passenger-side bracket compatible with the specified ProMaster model range. That makes exact side selection essential: this product should not be treated as a pair or as a driver-side replacement based on the supplied details.
Limitation: The product information provided does not describe material, included hardware, or additional fitment details. Verify that a passenger-side bracket is the part needed and check installation requirements before purchase.
Westin Silverado And Sierra Mount Kit
Best for: Buyers whose Silverado or Sierra matches the listed years and cab styles and who want a complete mount kit. The fitment includes 2014–2018 Silverado and Sierra 1500 Double Cab or Crew Cab, 2019 Silverado LD and Sierra 1500 Limited, and 2015–2019 2500 or 3500 Double Cab or Crew Cab applications.
Westin states that the kit includes required brackets, screws, washers, and nuts, with a design tailored to each running board. That included hardware and application-specific design make it a better fit for someone seeking a mount kit than a standalone extension arm.
Check before buying: Match the model year, truck series, and cab style carefully. The supplied information does not establish fitment for other configurations.
Buying Guide: How To Choose Running Board Extension Brackets
Do you need extra step drop or a mounting bracket?
An extension arm changes how far a step drops; a mounting bracket attaches or supports a running board on a vehicle. The AMP Research option specifically adds two inches of drop to select PowerStep kits. The other products are described as vehicle-specific mounting brackets or mount kits, so do not assume they change step height.
How should you confirm fitment?
Match the product’s stated vehicle make, model, year, and any cab or side requirements. Also check your existing step system’s part or kit number when applicable. A broad year range alone may not confirm fit for every trim, cab, or running board configuration.
What hardware or material details matter?
Check whether the listing identifies included hardware. Westin lists brackets, screws, washers, and nuts; the other supplied descriptions vary in detail. Material treatments can also matter for buyers considering exposure to scratches or rust, but compare only features expressly stated for the product.
Frequently Asked Questions
Are running board extension brackets universal?
No universal fitment is established by these listings. Each option specifies particular vehicles or compatible step-kit numbers, so verify the exact application.
Which option adds two inches of drop?
The AMP Research PowerStep Extension Arm Kit is listed as adding an additional two inches of drop to compatible PowerStep systems.
Can I use the AMP Research kit with any running board?
No. The supplied fitment names five AMP Research kit numbers. Confirm that your existing kit matches one of them.
Does the HECASA bracket include both sides?
The listing identifies a passenger-side bracket. The supplied product details do not say that both sides are included.
What should I check before ordering a vehicle-specific mount kit?
Confirm the vehicle year, model, cab style, required side, and compatibility with your running board or step system. Compare those details with the product’s stated fitment.