I sold my 16s to a 3-series owner for £185 last year. He put them on there and then so I guess they fit!
Leon_in_uk said:http://cgi.ebay.co.uk/BMW-Z4-Genuine-17-alloy-wheels-tyres-1-3-series-Z3-/140504775774?pt=UK_CarParts_Acc_Wheels_tyres_Rims_Car_Wheels_ET&hash=item20b6bcbc5e#ht_500wt_922
40 watchers at the mo fingers crossed!! They are the same size tyres so either front or back!