I THINK, (and I can't say specifically, cause I don't have one to measure), that they are the same mounts as a 1000XP, at least it looks that way in the photos..
The reason I didn't go that route is twofold.. Rock kickers, like they run in the east, stick out a distance from the machine, depending on brands the ones I've seen are 4 to 6 inches out. Given the seat in the RS1 is in the center, I'd think that anything that added width to the "cab" area would make entry and egress more difficult than it already is.. It will certainly mud up the back of your trousers getting in and out
I'd prefer something a little closer to the cab, and thought some 2x2x.250 square tubing would be the trick, I've mocked it up a couple times, but the hard part is finding something solid to bolt it to underneath.. There's not a lot there in the RS1 to bolt to for that sort of a design.. I'm more worried about high centering on something that blasting thru the woods missing trees by centimeters.. Riding the way I do, I'm not too worried about it because of the way the RS1 is built..
And FWIW, if you're looking at making mods to your machine for crawling, ask and I'll detail what I did to mine, planning in validating my mods at Sand Hollow the week of Oct 19th