XT wheels.

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Looking for some clarity on XT wheels please. Familiar with the ones with the K1 with year month and date that follows. I have some with only X on one side of the valve stem, and T on the other. Also ones with XT on one side of the valve stem. No other markings. These wheels appear to be a 68 build with NT (not Kelsey) in the center close to the stud holes. I like them because there IS no date, and can use them on different applications. Any help would be greatly appreciated. Thanks in advance.