Yours looks like what my feb80 had when I got it but I really couldn’t tell ya if its original to the vehicle. Be nice if a thread was put together identifying the different styles to the correct years.
Is the back rest sanded to bare metal?
the legs on those look like a pair i got from a 78 but I don't believe they have the bumpers. The hinge design is definitely different than the 80 I mentioned.I am only guessing at the year changes for the legs. I do know 79 had the wider leg like in this pic. Although 79 should be grey i think. These may be earlier seats as they have both the bumpers and the legs and they are black. Agree that a thread on the differences with pics and dates would be helpful.