When I was building my Sideoiler, I couldn't find one in stock anywhere, and operations like Pep Boys, AutoZone, etc. wouldn't even order one. Finally found one at an old independent auto parts store.
Mr. Fixit is right. Correctly aligned, and properly (read lightly and carefully) lubed with moly, they are very durable.
Trust me, they are the least of your worries in that drivetrain!!!!
Bud
