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What months was this wheel option available and when was it discontinued? 1970 only?
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This wheel was never offered as a factory option. As noted above, it was factory installed on Buick GSX in 70 only. Yenko offered the wheel as an extra-cost option on Yenko Deuces, and also offered the wheel in his catalog as an over-the-counter add-on. I believe the original Yenko catalog price was around 50 bucks.