Check amazon.com they have aluminum pans in all sizes. If you have an alloy wheel the metal thickness is about 3/4". I drilled and tapped mine for my winter tires. That length of hole makes for a nice thread gripping.
Once you drill the holes take the tires to a shop and get them balanced . They will not due it with the pans on but without still will balance any uneven hole drilling .
In that thickness of rim I went with 1/4-20 stainless steel bolts.
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