I think I have the cup as you call it. But if I remember correctly, it is too small of diameter to work on a six lug wheel. I assume the cup fits in the center of the wheel and bolts to the carrier. Perhaps it is for a 5 lug wheel?
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'72 K5 CST 350/350 Daily Driver
'69 GMC3500 Camper Special CST Flatbed 396/400 Upgraded to show truck
'69 GMC 2500 L6292, 3spd beater
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