Sprinter Side Step Extra Curved Tube Support Part - Heavy Duty Running Board for Mercedes Sprinter Van - Perfect for Off-Roading, Camping & Work Trucks

Extra Vanspeed Curved Support Bracket for 

If you have BOTH a factory AC and an AUX Heater you will need the additional Curved Tube Support part option in order to properly install your Side Steps.

You can see an additional picture for reference

Here is a video where Brent provides full detail on the need for this extra part.