As long as its a six lug, the "fingers" should fit into the same spaces. I have a set of steelies and it lays properly and will be a "compression" fit with no lip to stop rotatation like the alloys. I'm sure there are wheels around that it won't fit into but its just a flat piece of plates, shaped to fit into 3 of the holes where the lugs would normally be.
I thought about putting a "false lug" on the fingers to fit into the holes but since its supported on the floor also, I felt enough compression could be created to squeeze the wheel firmly into place between the back plate and the wheel plate.
But, let me know how you feel it works. If it needs the false lugs, then I'll have to add that in the next batch...