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For material, I've only seen aluminum.
I think the bigger issue is stud length and thread engagement.
The only hub spacers I've used are actually hub adapters to fit Porsche wheels on my 190e merc. They bolt to the hub and have their own studs. They're made by H&R so I trust them.
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1960 356 Super 90 - EFI'd
1989 190e 2.6
1991 964
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