No, The 68 GS400, GS350, and the Sport wagon all had the larger 2.834 bearing. I recon it was a more robust rear end.
I found 3 on e-bay.........for 149.00. Also found 68 NOS rear side marker lights for 59.00 on e-bay.Only 9 left. http://www.ebay.com/itm/1968-Buick-Rear-Side-Marker-Lamp-Assembly-GM-916585-/352025868395?fits=Year:1968|Model:Skylark&hash=item51f660786b:g:kvIAAOSwuLZY6OYO&vxp=mtr
Brian Trick, member here, does in fact have these bearings. Those rear marker lamps are being sold by The Parts Place, on the eBay store only I believe. $59/ea isn't a great deal, but not a ripoff either, there are no repros. I paid $100 for an NOS pair about 6-8 years ago.
He is selling RW507CR, I need RW507GR. The out side measurements are different. The CR has a outside measurement of 2.748 in and the GR has a measurement of 2.834.
Do you still have these. Please let me know so I can continue looking or stop my search. Thanks, Dale
I think I have a pair of axles from a 68 gs with great bearings on them......let me verify for certain