Just a follow up to let you guys know I took your advice and bought the belts from Wesco. I did not buy the hardware kit but did buy the angle bracket, which was available separately. Not sure about other models but since my 73 interior belts mounted to the trans tunnel, the angle bracket was necessary for attaching the inside portion of the new belts. They worked out well and were easy to install. I had a few pieces of carpet left over from another job so used it to cover over the cavity where the old retractors resided. Held it in place with carpet tape. You can't even tell the cavity is there. Thanks again for the advice.
Paul