I want to help, but to date I haven't compiled ALL steel wheel codes, becasue that list would get huge;
This is what I can offer;
I have a 1970 Pontiac 14x6" steel wheel code of 'AM' as being for 1970-1972 Firebirds.
I believe that the Pontiac A-bodies did share wheels with the F-body;
Although unlike the 1970 A-body, any Firebird with an F series tire received a 7" wide wheel (I believe that A-bodies could come with F & G series tires, but they retained the 6" wide wheel).
I even have in my yard what appears to be an original 1972 A-body wheel that is a G-series tire on a 5" wide wheel!? (code DD).
My notes suggest that the KT 14x6" Rally II was a 1972 A-body wheel.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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