Cheers Lars, I checked my spare last night, and as you say, the offset on a Mk1 172 is 43. As the 16v has an offset of 36, assuming the phase 1 16v wheels are 7" wide as well, the wheel will sit in the arch 7mm closer to the body. Is it worth trying a 5mm spacer? Or just not bothering with spacer and/or wheels?