just and FYI - this rear uses different bearings unique to the 66-68 big block GS's and all motor sportwagons (and a few other GMs) and are getting quite a bit difficult to source Here's a good post about it http://v8buick.com/showthread.php?t=88264&highlight=68+sportwagon+bearing
Hey Jim, Hope the couple other members here shed some light on what it will fit....I took cover off and they looked good....Thanks Steve
Hey Alan, from what you said, my buddie had a hard time getting some for his 68 rear also....he found them but I cant remember the source...Thanks Steve
X2 When I got the original posi rear from my '68 GS rebuilt there was a '69 GS rear being rebuilt there at that same time. My 68 had 4 pinion and the '69 had 2. My 68 also had larger axles and I think it used a few other parts that were different than the '69 rear. And yes, parts were not easy to find for these rears.