Wouldn't it just be a generic GM 10 or 12 bolt if it was from that period ? , or were there differences between BOP and Chevy ?
Your not thinking of the 58 - 64 Olds rear are you ?
"All the olds cars built in america are supposed to have had this strange weak o type 12 bolt that's more like a 10 bolt strength wise. "
What about the 442 W-30 and the full size cars with a 455 , surely they would've had a full strength 12 bolt rear ? .
I just noticed we registered at the same time but you got over 5 times as many posts as me
Here's a link from an Oldsmobile website giving 12 bolt tips , it only refers to it as GM 12 bolt and doesn't seem to differentiate between BOP or Chevy............