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Return to Parts List Category : L- AR Engineering Products ARE AR121 MOTOR PLATE HOLD DOWN KIT L BRACKETS U-WELD. MOUNTS MOTOR PLATE TO FRAME $30.00 Pair of L brackets to attach a motor plate to the frame rails in any A-body, B-body or E-body car.  Brackets are bent at correct angle to mount behind the motor plate.  Brackets can either be welded to the frame rails, or bolted down.  Made from 0.188 steel and zinc plated.  Brackets only, no hardware is included. Can be used with AR133, AR146, AR204 or AR205 Used With: AR133, AR146, AR204, AR205