Phil,
I got my set from Chevy Duty (Now Classic Parts) and they were of excellent quality. Also check our sponsor, American Classic Truck Parts as well.
I remember now what automarc was talking about as my thrust washers were shot as well, and the wear pattern in the axle did look like a "bushing".
Good luck and get a shop manual, it will really be of help as you rebuild. Let us know how it goes, and be sure to take your time. A little patience now will serve you well down the road.
