R6 is particularly narrow for an 18' wheel. The 332 kit barely fits as it is because of the ending of each spoke on the wheel actually flows back into the inside of the wheel some. So if you where able to get a wheel with a smaller offset it may fit but will be REALLY snug. The 355 kit has been done (not my car) but it took some cutting of the inner side of the spoke of the wheel by about a quarter inch if I remember correctly.