Availability: 7 in stock
The cap here is the FORD part, numbered e9hz3113b. It is catalogued under Covers & Caps > Caps & Plugs.
Covers that seal a fluid opening normally carry a single-use gasket or O-ring, and reusing the old one is the usual reason a leak comes back.
The part number is the thing to verify. Where the old part carries no legible number, a VIN and a photograph are enough for us to identify it. Handed to the carrier within one to two business days from our US warehouse, free over $59.