Cometic, EST top end gasket kit. Twin Cam 3-7/8" bore - 99-17 95"/103" Twin Cam (excl. Twin Cooled) (NU) 561437 45407-83 25-1/4" is standard length

45407-83 25-1/4" is standard length for 83-86 FXRD

O² Sensor Port PlugAllow non-sensor HD models to run newer-style exhaust systems equipped with O² sensor ports

includes everything necessary to install a Drag Specialties tourbox or H-D Tour-Pak®

total width (widest point) 27cm

Cometic, EST top end gasket kit. Twin Cam 3-7/8" bore - 99-17 95"/103" Twin Cam (excl. Twin Cooled) (NU) 561437 45407-83 25-1/4" is standard lengthWith MLS (Multi Layer Steel) . 051" thick head gaskets. The SLS (Single Layer Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are . 020" thick and have . 001" of high temperature viton rubber coating on both sides. Kit comes with all gaskets, seals and o ring for a complete top end rebuild. Note: Kit comes with 99 04 style valve seals and 99 10 style breather gaskets.