FWIW - I ran into a friend who had just purchased some chromed Fiat 124 wheel bolts off eBay. So ... I borrowed one ...

The Urraco bolt is a 12 mm bolt w/ most of the shaft threaded at 1.5 pitch, bolt head and 'flange' to hold the wheel about 1/2" long together (forgive the English measurement) and overall length ~ 40mm .

The Fiat bolt on the other hand has a deeper head and 'flange' ~ 3/4", a non threaded portion that together w/ the deeper dish extends about 1/2 of the length of the Urraco bolt (not good IMO), a pitch of 1.25 (that's a clincher) and an overall length of ~ 51mm.

So, based on this SINGLE sample, Fiat bolts don't look too good to me ... I'll have to ask Kim and 'Chelle again about what they used.

Regards,

Bryan
'74 P250S S/N 15622
Indianapolis Indiana USA
blissinindy@yahoo.com