I just installed a new clutch kit on my 1999 OB DOHC. I was shocked that the throwout bearing (clutch release bearing) had a plastic or composite sleeve. I used the Exedy clutch kit. The Clutch I took off the car was not the original. The person I bought the car from had the original clutch replaced by a shady mechanic who used cheap parts (made in China). The throwout bearing I took off also had a plastic sleeve. I'm assuming the original one had a metal sleeve. Is this correct? One good thing about the plastic sleeve is that it will not wear a groove in the transmission snout. Do you think I should have sprung for an OEM bearing? My guess is that all new cars with Manual Transmissions have throwout bearings with plastic sleeves. Kind of like all modern cars have plastic radiator now a days. Thoughts? Other than the sleeve, the bearing seemed well built.