What to do about getting a seat

I have a '77 xs750 that is complete except for a seat, I've been considering the options to getting one and so far I've come across a few with varying difficulty. You can make a metal seat pan, or mold fiberglass for a seat pan, and cut the foam and do the upholstery yourself, or you can order a premade one online. I'm ok with welding different mounting points on the frame to get a different seat to fit, I've just been having trouble getting a seat that fits because the loop on the back was a custom job and is about 22" long, which doesn't seem to be a common length for the seats I find online. Anyone know what the best option from here is? Any good custom seat fabricators? It's the last big part of the build and any help would be greatly appreciated via /r/CafeRacers https://www.reddit.com/r/CafeRacers/comments/expfrm/what_to_do_about_getting_a_seat/?utm_source=ifttt