Hy guys, I have done some research on this, but I don't have an American parts book, so this is a somewhat educated guess. My books only list the bearings as components, not the bearing assembly
GM p/n Bower p/n Napa p/n price Rock Auto price
inner cone
121470 3383 BRG BR3383 $41.99 3383 $30.79
inner cup
121485 3320 BRG BR3320 $23.99 3320 $17.26
outer cone
121483 [timken]2687 BRG BR2687 $29.99 N/A N/A
outer cup
119361 2631 BRG BR2631 $17.49 2631 $12.84
Seal Victor 49642 = National 6511 = Napa NOS 16168 $11.49, does not seem to be available at Rock Auto. I hope this helps, trying to cross New Departure/Hyatt part numbers is VERY FRUSTRATING, take your sample bearings with you to compare.

Last edited by 3B; 04/15/2009 3:52 PM. Reason: omition