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The 2613 designed for the JConcepts F2 body assists in maintaining the rear body height while utilizing the forward mounted shock configuration on the Team Associated B6 vehicle. The rear body mount flange gives a small shelf for the body to rest on after the user has cut the body shorter while running the shock tower on the front-side of the transmission. A unique aftermarket piece which helps the body maintain proper running height after mishaps and crashes.
The instruction calls for four 3x12mm BHCS to secure the rear tower to the transmission mount. To add the flange piece, it is recommended to use two 3x14mm FHCS to account for the additional part and secure into the mount designed for a flat head type screw.