In my case, I talked to a couple of local dealers - One said I would need to come by and the other gave me a regional phone number to call. The rep at the other end was initially resistant, but I calmly pressed my point that I was fundamentally unhappy with the OEM tires.
The rep would not commit to my request, but indirectly suggested that when I went by an authorized dealer they would work with them to authorize the swap. Turned out exactly that way.
Interestingly, although I was/am pretty happy with the Revo2s, I have had some speed wobble that I can't get rid of, which I will post about pretty soon...
Good luck,
DP