These Anti-Slip springs are specially designed to fit our 3" harness adjusters. Virtually eliminates belt slippage and helps keep belts snug. One spring required per adjuster.
Seat Belt Mounting Back-up Plates are 4" x 4" x 1/8" steel plates with a pre-drilled 7/16" hole. Required by SCCA when mounting belts directly to the body of a car.