Differences between A and B-body retractable seat belts

Does anyone know what the differences are between bench seat A and B-Body retractable seat belts? Are they the same? What about 68/9 versus 70 retractable belts?
Basically, I need a pair of the retractable portions for a 69 B-body with a bench seat and am just trying to figure out what is compatible.

Thanks

Stan

You might try this guy Stan, I think he was a member here too.
http://allmoparseatbelts.com/bbodybelts.asp
Bill Edwards is his name.
Matt

Matt,
Will do. Thanks.

Stan