Re: XT and IF steel wheel???
Colvins' book has a copy of the Kelsey-Hayes engineering drawing for a "14 x 7 JJ wheel." It shows that such a wheel was furnished under 2 codes, IF and XT. The IF codes reference 97xxxxx [Pontiac] part numbers; XT codes are 39xxxxx [Chevy] part numbers. Each was furnished 4 ways: bare, oiled, primed and primed with a service label. So it appears they are the same.
GM used 14" x 7" wheels on millions of '78-'87 G-bodies and possibly '78-'79 X-bodies. They are virtually identical to IF/XT wheels except I believe they have 4 hub cap mounting pads.
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