The socks originally came from Ren & Shirley at The Upholstery Company in Mesa, Arizona, but they retired a few years ago...GREAT people, btw.
I bought this and had my daughter-in-law make them for me. I gave her an original one off my speakers and she used it as a template.
They have some cheaper fabric, but you can see through it, which I didn’t like. Some have said this thicker fabric blocks some of the sound, but I found that to be complete poppycock! You need 6 linear yards to do both speakers, so kinda expensive, but mine came out looking brand new. It only comes in Black. The thinner, cheaper stuff has different colors.
Do you have the larger interfaces with the supports, or the smaller box? Mine are the larger ones. The bases are different.
Sorry, I live in Northern Colorado or I’d be more than happy to help in person.
Good luck!

