Keep us updated please on what you have to do to get them to fit. Especially if it can be done with limited, no rolling, fender work.
The MXs have a section width of 9.3" which is the same as the Hoosier A3SO3 which I would love to run at autocrosses. I have a set of Kuhmo V700 (9.1" section width) waiting to mount on slipstreams that are in UPS limbo. BTW - all 225 50 16 measurements.
What suspension are you running - track and street? I have KYBs set at 3 and 7 for autocrosses - the only time the V700s will see pavement.