Folding Stadium Seat With Back (Redwood City)

I’m in search of a folding stadium seat with a back for indoor use. I do not need a frame, or straps, and it does not have to stand up on its own. Photo is an example.

It will be used to make a metal chair more comfortable for long-term sitting. As long as it’s clean, I don’t care what color it is or if it has a design or logo. The thicker the better!

If you have one that you no longer need, I will gratefully use it immediately.

Thanks!