Here’s a pic from a set of 79 jump seats in my garage. Wide leg, no bumpers and grey (and rusty).
Sorry for the thread hijack. Looks like you need a ‘80 model year and later to match what you have. Good luck with your search.
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...