might need 5mm spacers, but i doubt it
we ran ET38 (i think) with 205/50 15's and that car was LOW with an 8mm wider rear track and it scrubbed a bit (only at the bottom of paddock hill at Brands and through eau rouge at spa, and on occasion down the A4141 in birmingham

)
so with mk1 172 wheels (i forget the offset, 42 is it?) you should be fine