Hi Jerry and mid-60s Buick fans,
I am interested in installing rear seat belts. (Grand Kids) I found non retractable dark red w/ aviation style chrome buckles from a company called RetrobeltUSA. Has anyone ever used them? the belts come in a 60" and 75" total length. I don't have a later A Body car to measure the correct length. Any help or advise would be greatly appreciated.
I don't know the answer to your question exactly, but perhaps I can give you a helpful pointer. I upgraded the front seat belts to replica Buick retractable seat belts from 1967-68 in my 1965 Special wagon. I then had refurbished and put the old front seat belts in the rear. That replaced the generic seat belts that my Dad had put in car - for me! (back around 1970 or so.)
The front belts work perfectly fine in the rear. So you could measure the length of the front belts and use that as a reference.
Hope that's some help.
Cheers, Edouard