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I'll bet the "WT" is s suffix for Wide Tread...and was mistakenly used to describe the wheels rather than the tires... I have often seen "WT" used when referencing wide tread tires, and have never seen nor heard of a "WT" brand of wheel. If the mag wheels were put on at Yenko I would still bet that they were Atlas mags.
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Pure speculation, and while we are speculating, it was suggested when this document was found several years ago that the "WT" might be a typo - but for "ET" mags since the tire info was described pretty well in the next sentence. Either way, I think we've seen enough strange stuff come from yenko, that I wouldn't consider it outside the realm of possibility that a non-Atlas mag wheel could have been installed - we have '68 v/t tops installed on '69 camaros by the guy down the street!
This might require another thread, or resurrect the old one, but it would be interesting to know when the Atlas wheels became a reality - compared to the build date of this Nova, ie; maybe the Atlas wheels were not mfg'd yet (?). Cool topic