The only people that I know of who can supply a STEEL, 76mm stroke, crankshaft are:---"Nanni Ricambi"---part number:---ART 0290 at E1,098. There well be other companies in Italy who can supply a '76mm' crank, but you would probably need a contact (or relative) in Italy who is prepared to do some research on your behalf. D'angelo Motori can supply a CAST-IRON 76mm crank---part number:--D5179---cost:--E1270.5 (IVA excluded)