I had the same size tire on my stock tire carrier for a little while, but I had the opposite problem as my snubbers didn't touch the tire. This was due to my wheels having 3.75 inches of backspacing verses whatever the factory Ravine wheels had (5.5 inches, I think). I bought some extra snubbers and cut them down with a hacksaw to fill in the gaps I had.
If you put the snubbers in a vice with the height you need even with the top of the vise, the vise jaws will make a good guide so that you get a clean, even cut. Cut the outer end of them, not the base. You don't want to cut off the area inside the snubber that the wash/bolt head sits on. Also, don't cut them too short.
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