1980 Fiat Spider FI Computer

I have a 1980 Fiat Spider 2000.
It has been giving me alot of problems lately.
My mechanic told me I need to change the "computer"
This is the Fuel Injection Computer.
I am having trouble finding one, used or new/rebuilt.
I would like to stick with OEM. Anyone know where I can find one?

Thank in advanced

A very good question. There are two parts houses in the US that should know how to find a computer. International auto parts (800-726-0555) and Vicks auto ( 800-466-3428). If these guys can't help you we are all in trouble.