Temporary saddle blanket, Indian blanket, etc., seat cover

I need a temporary saddle blanket, Indian blanket, etc., seat cover to bide me over till I do my bucket seat conversion down the road. I've contacted a few companies that were reasonably priced but they're all stating they don't do older cars. The generic ones you see online I'm not sure they're going to be a proper fit and don't want to just throw my money away on something that's going to be useless. Has anyone purchased and temporary set covers and who did you get them from?
This is just an example:

Thanks