[Baron Von Zeppelin]

Originally Posted by Baron Von Zeppelin

I think you have it right about 15x7 R2's phasing over from being inclusive as 14 R2's on the GT option.
The RIM size between 14 and 15 didn't effect R2 option cost.
It was the TIRE size that brought upcharge on a 15 R2 combo.
WW4 bumped the size rim - and then style (R2) was covered under GT.
WW4 covered the 15 rubber

Not 100% apples/apples - but to support that paragraph
I used a 71 Judge for the instance

14x6 R2 inclusive
15x7 R2 upgrade - only incurred a Tire Charge

No upcharge on the actual R2 Rim Size
fwiw