Royal Enfield Bullet Motorcycles manufactured prior to 1999 had cast iron bushings in the transmission on the lay shafts. These are the superior bronze bushings which are used in the current transmission. They have a much longer service life than the cast iron ones. If your gearbox is getting a little "growlie" you will want to try these. The kit includes both bushings, one for each side, and a gasket.
Fits 4-speed Iron Barrel models