While Bruce's Parts Bin is reliable and a helpful place to get parts he is in New Jersey, since your on the west coast you might want to check out a few of the Fiat vendors linked below that are closer than the 2500 miles Bruce is away from you.
http://pub79.ezboard.com/ffiatcenterfrm34
If you have the money to fix/replace the turbo it's considered by most the way to go, there are already enough 2000's that have had the turbos removed. There is a very noticeable difference in power, as well as smog test issuses facing you if you do take the turbo off.
John R. Rushton
79 Spider 2000
http://pub79.ezboard.com/bfiatcenter