Can anyone help identify this seat.

[BreBar]

Can anyone help identify this seat. I am in process of rebuilding a 74 b750 and thought I was buying the correct seat. It was not. So I'd like to know what this seat does fit originally. It has two bolts in front and four bolts in the rear (two on each side).
I know the 74 takes a swing latch that connects the seat. Perhaps this can be converted with the right hardware?

Thanks for the help.