I should have access to both on the 13th at the next autox, just a matter of me doing it.
place a level against the top edge of the fender (outermost point) and measure from a wheel with a known width and offset ....... record measurement in mm.
measure to most restrictive points on the inside as well and record measurements. not sure if height is an issue for the mki and mkiii like it is for the mkii up front so I'd be looking for height restrictions in regards to tire clearance as well.