Dave,
If you need a Fiat 127 camshaft (standard) I have those in stock. BRAND NEW STOCK. You do not need to go to Europe for this. I also carry a hot-street regrind of the Foat 127 cam (SRL270) that make for a lively improvement. I have many street cars using this cam.
If it is an 850 block (4mm shorter than the 903 block) then I carry the actual gears and can install one of those on your current oil pump drive shaft. If it is a 903, then the one from an A112 or 127 will fit. Do not by the pump drive shaft from a later Cinquecento !! While the bear and the pump part are fine, as these engines do not have a distributor, Fiat left the drive part off the top of the shaft. As long as what you are gettin it from had a distributor, all should be good.
Take a look at my website
www.scuderiataopolino.com for further information/ideas. I am located in Raleigh NC.
Regards,
Paul Vanderheijden