An engineered jounce bumper with a built-in metal cup smooths and controls bottoming out

031" fiber reinforced paper with a silicone bead

53-54 SERVI-CAR

Compatible with stock crank sensor & coil

Kit includes throttle plate

PS, 412 series shock set. 11". STD Duty. Chrome 1982-03 Motor delar Evo 84-99 An engineered jounce bumper with412 series shocks: Best value Progressive Suspension shock, great as stock replacement. Nitrogen charged double steel wall body. Multi staged velocity sensitive valving. Five position cam style preload adjustment. Note: Black 412 shocks may be supplied without lower cover. What are Progressive Suspension's 'Heavy Duty' shocks? If you are a lightweight rider with a lightweight passenger, STD Duty is probably your best choice, heavy duty shocks will