The Part# will be the NOS# on the box, The Casting# will be the number on the part.
Use these numbers when looking for parts on ebay or partsvoice.com
You can also use these numbers to verify what your part fits if you have a loose part off a car.
77-80 car 4cyl part# D9FZ9275A , casting#s D7ZF9275BA, D9EF9275AA, D9EF9275EA.
also fits 77-78 Mustang II 4cyl.
77-80 S/W 4 cyl part# D9FZ9275B, casting#s D7EF9275BA, D9EF9275BA, D9EF9275FA.
77-79 car v6 part# D7ZZ9275A, casting#s D7ZF9275AA, D9EF9275CA.
ALSO FITS 77-78 Mustang II v6 & v8.
77-79 S/W v6 part# D7FZ9275A, casting#s D7EF9275AA, D9EF9275DA.
75-76 car v6 part# D4ZZ9275A, casting# D4ZF9275AA.
also fits 75-76 Mustang II v6 & v8.
75-79 S/W v6 part# D5FZ9275B, casting# D52F9275BA.
75-76 S/W 4cyl part# D5FZ9275A, casting# D52F9275AA.
74-76 car part# D4ZZ9275B, casting# D4ZF9275BA.
also fits Mustang II 74-76 4cyl.
74 S/W part# D4FZ9275A, casting# D42F9275AA.
72-73 S/W part# D2FZ9275A casting#s D22F9275AA, D22F9275AB, D22F9275AC.
71-73 car part# D1FZ9275A, casting# D12F9275AA.
71-72 car part# D1FZ9275C, casting#s D12F9275BA, D12F9275CA.