no a 5door one wont fit mate you'll need them for a 3door fez, is it just cos of rust on the arch itself them u want a new quarter?! as it'll be cheaper anyway just getting the arch done rather than a whole quarter panel............

Ps u can get 3door ones

http://cgi.ebay.co.uk/FORD-FIESTA-MK...2%7C240%3A1318

But if u can get hold of them would be better getting genuine ford ones imo