Are you talking about the rear wheel bearings, or the bearings in the differential?
Anyways, if you give Brent a call at Loyalty Auto Service in Kitchener at 519-571-1225 he can help you out - he's a really good guy. I bought my Corvette from him 5 years ago. He knows a lot about Corvettes. Tell him Dave from Saskatoon who bought the red 1969 convertible from him 5 years ago sent you.