hi ive say quite a few cars that have 4 studs for wheels.... e.g corsa, micra, fiesta ect...

what other makes other then fiat obviously! fit onto a fiat?

ones that will fit:
Alfa
Lancia
Fiat

Alfa and lancia wheels will fit too

Offsets might be wrong for the Sei

4x100PCDs are:
Renault Clio
Old Polo
Old Ibiza
Toyota Starlet

Just have a look through here http://www.rochfordtyres.co.uk/fitmentguide.asp
Remember 4x100 fit with wobbly bolts

cheers so im looking for:

34 offet (MAX)
4 x 100PCD (or 98 if i can get them)
14" alloys
whats the best thickness of wheel? 5"?

Standard rims (Sporting anyway) are 5.5" wide, any wider and your looking at problems with fouling or requiring different spacers to compensate.

Liam

Just to throw a spanner in the works i have 6j wheels with no spacers. Sorry had to say it. But best to stick to 5.5.

ideally u want 4x98 wheels!

any ones that will fit a punto will work with spacers an longer bolts, they are the best ones to go for as the stud pattern is def goin to be the same!