485" on Shovelhead

you’ll collapse the sealing area and tear the seal - A 12 point 12mm socket catches the shoulder of the guide pretty well and can be used to push the seal on to the guide until it just bottoms out

Hex style cap with a shallow dome

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

13-17  FXDWG

S&S, PRECISION HYDRAULIC TAPPET SET 99-17TC Baklampan/Taillight 485" on ShovelheadComplete drop in set for one engine. Each individual USA made S&S Precision lifter is hand assembled to exact tolerances. Designed for quiet operation, rapid pump up and compatible with all stock and high performance applications. USA made. Upgraded replacement for OEM 18538 99C tappet. Fits: > 99 17 Twin Cam; 17 21 M8; 00 21 XL; 08 12 XR1200; 00 10 Buell XB Supplier No: 330 0718