Are there any aftermarket floorboards that work with the stock XC peg mounts, without having to redo the whole mounting hardware?
Short answer: I don't know -- I have an XCT.
Longer comment: If I didn't already have an XCT -- with the three height adjustments, and some angle adjustment -- I'd look into seeing if the Rivco adjustable floorboards can be mounted. What I'm talking about are the 'Wing and H-D adjustable
mounts found on this page: http://www.rivcoproducts.com/products/home.php?cat=272
Now before you have a fit over the c. $400 price, I just looked at the Vic part prices (here, which is one of the cheaper places: http://www.donwoodvictory.com/fiche_...12&fveh=118001
), and when you realize that you have to buy two of everything, the prices are similar. You can also think about how much of an investment these bikes are.
I had something similar on my Valkyrie: see image 17 at http://www.billanddot.com/valkyrie/
if you're interested. Those were from BigBike Parts, as I recall, but they were not adjustable without using a ratchet and Allen key (kind of like the XCT boards, but they had more adjustament range). The Rivco ones, you just pull a spring-loaded pin or two, reposition, and release. In that sense, they're better than the stock XCT ones, and if I didn't already have the XCT boards, I'd contact Rivco, maybe email them some XC peg mount photos, and see what they have to say.
Just a suggestion.