Top Gear Replacement bushing … more durable than oem , .071 longer for less rocking movement and greater surface area spreading shock load. No oil holes as they have shown to be weak points in bushing .. recommend using TriboDyn 75w-90 ceramic EX2 or a high quality synthetic 75-90 Non oem Yamaha/ Cat gear lube and fill chaincase to top of sight glass for greater capacity and cooling.. press out old bushing and press new bushing in carefully without damaging gear . Does not include gear , bushing only with installation required ! I have the gear oil above in stock