Each year had its own run of keys particular to the year. For 1971 it was these part numbers.
7027275 2.187 All KEY (square head) AR 1971 1971 **2-6
7027281 2.187 All KEY (round head) AR 1971 1971 **2-6
Chad
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1966 Ford F250 Deluxe Camper Special Ranger Custom Paint - San Jose plant
http://www.ford-trucks.com/forums/12...al-ranger.html
1966 Ford F250 4x4 Red/White 4-speed - San Jose plant
1966 Ford F250 4x4 White 4-speed - San Jose plant
http://www.ford-trucks.com/forums/11...-f250-4x4.html
1971 Trans Am White/Blue 4-speed limited options - Norwood plant
http://forums.maxperformanceinc.com/...d.php?t=757496