All three outside locks are Fiat and can be keyed alike. After thirty years, many cars have mismatched lock sets, and getting a key for one lock might not give you a key good for all three locks. Find a good ole boy locksmith, drive the P-car over to him and let him work his magic. Don't go into the Home Depot lock aisle :-)
While you are working on outside access, does your car have the added cable to release the front hood lock if the stock cable should ever break?
Steering column is European Ford Capri
Good luck
Larry