I got these from Amazon when I lost a foot off my R800C. It is a 8-pack, so it’s more expensive than the ones @SoulReflection linked; but, as I mentioned before, they are virtually identical to the ones that come on the 2x10 cab. Looks like the ones SR linked are too. I suggest using real wood screws, though. Those little sheet metal(-ish) screws can pull out too easily. Regarding the cover: I looked at mine (the Fender-branded cover), and I think there’s enough slack in the cover to go over side-mounted feet. It may make it a little more difficult to put it in; but, it looks like it would fit.