What year are these bucket seats?

I ordered 75-76 swinger seat covers. They look like they should fit. I got a sheet of foam in case I need to repair or reshape the foam for a better fit.
I pulled off the "lockouts" from the seats so they tilt forward. Looks like I can easily fabricate a latch if needed but really dont see the need to have them latch.
I will post and let you know how they turn out when they are done.
I still need to come up with some seat brackets.