I thought I would post this part number since I couldn't find it anywhere and I know other people are asking about it. This is the GM part number for the lug nuts off an H3T with black steel wheels. Part # 9594683, they are required to hold the center caps. I discovered this after I installed the black H3T wheels with 35's on my H3. Hope it helps.

 

Sweet! Thanks for that! I have the steelies too!