I've got a set of moose hybrids, but have not installed them yet. Before I do install them I do have to do a bit of grinding as lankydoug mentions to get the one to fold. I got the YZ version and thought they had a bit of material taken off for that side, but not on this pair. I am also going to grind down the outer teeth, as they look pretty lethal. Not sure about packing with mud, but they look like they will clear as well as my stock KTM pegs, which I never bothered me. These are heavy pegs and very stoutly made.