This is an optional Custom Works RC10B5 and RC10B6 Dirt Oval Adjustable Toe Rear A-Arm Kit, intended for use with the Associated B6.1. This adjustable rear arm will fit the stock B6.1 buggy as well as most of the B6 and B5 based Sprint conversion kits on the market. Rear Toe is adjustable up to 8 degrees of toe in or out in each arm.