Re: anyone know what this is called or where i can get one?
That's not how to measure a rim. The diameter is at the bead. Same for the width (inside to inside at bead).
Regardless, the actual size will be stamped somewhere on the wheel if it is DOT approved.
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1971 C20 Custom Deluxe, HT383, 4L80E, 3.73 Locker, 4 Wheel Discs
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