B2 Rear Wheels

[pwc167]

Guys, I have an RC10B2 that I bought right when they came out. It came with 2.15" rear wheels (which are still on it). The Associated PN in my book is 9490, I recently picked up a new set of 9490 wheels and they are a little larger (2.2"), like my B3's. Did Associated update the wheel size and keep the same PN or am i crazy? If so, any idea when this changed? I'm building another B2 from NIP parts and want it all correct to the first version released. Thanks for the help!

[Charlie don't surf]

Same wheel in 2.2, same pin and I.D. as well- works fine