Check out "Leupold's Custom Shop Order Form Page"
and it'll probably answer your question. If it's a Vari-X I, you'll find that it's not listed on their sheet of scopes on the second page that they make changes to. You could always call them and ask them about it though.
Don't know if the Stoney Points would work or not, but I've never really considered them a good alternative to factory style turrets. Your's is probably a friction type adjustment, so maintaining the adjustment, even if the Stoney Points fit, would not be something I'd personally be comfortable relying on.