There is an Oldsmobile restoration company, damn I wish I could remember the name of it, I used to have the book when I had my 72 Cutlass Supreme, but when I sold the car I let the guy have the book with it.
Anyhow, you could order any part for your classic Oldsmobile. I will see if I can remember the name of the company, but I could order any stock part from that era through them.
Try here. I didn't look through all the parts... Try page 121.
http://www.usapartssupply.com/cate.doc