New 20x9 Detroit Steels OEM center cap question

[Moose62]

So I put the 20x9 Detroit Steel Wheels on all for corners. 5.5" bs on front with a 255/45/20 at 29", 4.5" bs on rear with 295/40/20 at 29.3". No rubbing. That said....

I want to keep the stock 2wd center caps that are held on the the three screws. But I can no longer use the three screws due to the extra lug pattern on the rims. Is there a lug with a washer that would tighten the rims yet snug up the center cap via a washer or shank set up catching the center cap? I don't want to use the newer dual threaded lugs or plastic caps. Must be original 79 c10 caps and metal lugs.
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[bbbc10]

Maybe find some washers an maybe attach the to the back of the cap or better yet make a circle out of steel an attach it to the back of the cap an drill 5 holes for it to slide over the wheel studs an out lug nuts on

[Moose62]

that's one way but I was hoping for something as easy as a lug with a washer. I see the shank lugs but im not familiar with those and their purpose