I have a set of steel Saturn wheels that I've been looking at and measuring for my Saturn TDI project. In my case, I think I could drill/tap the center hub ridge (the raised center of the wheel just outside of the mounting lugs) and bolt a 16" aluminum disc directly to the wheel. The disc wouldn't quite seat on the wheel rim (looks to be about 1/8") or clear any wheel weights, so I'd have to run stick-on wheel weights to fit under the disc. On the front wheels, I'd also have to cut a bit off the end of the axle stub to clear the disc.
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