Part of the PRW Anti-Twist Servo Mount System introduced on the 4.8 platform, this product is for only the pair of angled aluminum blocks. This is the very bottom base of the anti-twist system.

Bottom screws anchor to the chassis using a 4-40 x 3/16" flathead screw, aluminum preferred. Screw on the angled face, when carbon is present, accepts a 1/4" long 4-40 screw.