http://www.classicperform.com/6092chevtrk.htm it is about 3/4 of the way down the page listed under "Slip Shaft Driveline" it is part# CPPCB Carrier Bearing - billet & polyurethane its going for $109 ... but was well worth it in my opinion.
send a PM to Jeff a/k/a CPPJEFF here on this site and he will be able to hook ya up.