Well, I know you can buy the correct wrapping tape, and various clips separately. I've never checked on the cloth covering though. I don't recall seeing that anywhere.
Unfortunately you would have to snip the terminals off to slip the cloth on, and then have terminals ready to crimp back on.
If they can add the cloth, then I would assume a roll of it is buyable somewhere. We'll see what they say or have to offer if they get back with me. Hopefully for a small fee they'll offer the cloth and make it right.