Wilwood 120-11875 Wilwood Caliper-D154-Raw/Un-Painted 1.12/1.12in Pistons 0.81in DiscWilwood 120 11875 Wilwood Caliper D154 Raw Un Painted 1. 12 1. 12in Pistons 0. 81in Disc Wilwood's D154 forged billet caliper is a direct bolt on, lightweight, high strength, extreme duty alternative to the OE cast iron calipers that were used on a wide range of factory disc brake equipped mid size GM cars and small trucks beginning in 1978. Use of this caliper can still be found on some GM models as late as the year 2002. The wide spread and