Gallaaudi

I need some help with my 1986 Audi Coupe CGT 2.2l. I noticed fuel leaking from front end of car and searching the Audi-world forums. Found it to be fuel pressure regulator. I have searched many recommended web sites from users that show part No longer available or out of stock. And parts I have found on ebay advertising this part for Audi 4000 ect but then saying not compatible with my vehicle. My car has been down for over a month in my search for part. Does anybody know the part number and if a fuel regulator from another German car will interchange by direct install and go. I need help any leads would be greatly appreciated. I'm starting to think I might have to sell it with some parts getting hard to find. Thanks for the help