$3.25
The oiler felt 2.75″, 3.5″ or 3.75″ sits between the felt spacer and the oiler plate in the piston cup kit in the rocker arm.
Western part:
3-3/4″ 1400 350 330
3-1/2″ 1400 350 331
2-3/4″ 1400 350 332.
2.75″, 3.5″, 3.75″