I called Ca cover for my 50 Ply wagon. I wanted just a cover that would keep the dust off it while in the garage. They asked me a few questions and about 3 weeks later I got a cover that fit exactly.
To be honest, I was shocked that they had something that off the wall on file and made one that fit very well.
I would call them and ask about the different types they make. If you want one for just dust in the shop, that's one kind. If you want one that's is water repellant and for dust, that would probably be another model.