The Rhino-Rack Heavy Duty leg height spacers are 10mm spacer blocks sold as two pairs to help level the height between crossbars. Designed specifically to fit Rhino-Rack HD bars, they install simply by placing the spacers between the leg unit and the crossbar until all bars reach an even height. The spacers provide a quick, mechanical way to align multiple crossbars for consistent clearance.
Rhino-Rack Heavy Duty Leg Height Spacer - 10mm - 2 Pairs