The RC's engine produces almost the double amount of heat that the VTR's
So even if you can fit them, they will never manage to cool down the RC, especially in traffic and/or above 7000rpm. Otherwise they would cost the same as the RC's OEM rads costs
Why don't you find out how many k/cal they're meant to shed per hour and compare the two types of rads. You can't just look at price. How about off of a VFR or Goldwing? I'd bet a Goldwing has fairly big cooling needs! It's free to check.