My dealer had ordered me some 16" steel rims that they believed would work but they ended up rubbing lightly against the brake caliber. We tested out a set of 3rd party steelies that had the same measurements as the GM ones and they did fit. The difference was the design/depth of the wheel between the lug nuts and the tires. Look up winter tires on the forum search function and you'll find the part #.
Good luck
Personnaly, I'll mount the winter tires on the factory wheels and I went with aftermarket wheels for summer:
Steel wheel is the best for cold season and they are appropriate for driving in all kinds of winter weather. It's little expensive than aluminum.
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