I have quite a few of the top clamp attachments that do not fit any machines I have. A couple button hollers too.
I don't actively seek out machines for them, but I always check them with each machine I get to see if they'll fit.
What I wish is that I could come up with a chart that said which off set and tab widths fit what machines. That would be a good help.
I've even amassed a bunch of high shank feet too. Got one maybe two machines they'd fit, but the machines already have their feetsies.
Joe