Dana Spicer with 12-1/4" Fast-Rise Brakes - Pre-1996, MUST USE WITH FABRICATED OPEN END BRAKE SHOES AND 1-1/2" DIAMETER ROLLERS., WHEN CONVERTING FROM EARLY DESIGN FAST-RISE WITH 7/8" S-CAM HEAD, MUST REPLACE ALL CAMSHAFTS., MUST USE WITH BRAKE HARDWARE KITS: CQ67405, CQ67506 or CQ69006.