Honestly these came on this car when I bought it and I haven't taken them off because I'm not driving it in the winter anyway. They're an OEM wheel for the W210. Per this site, Details: Sador - Mercedes Wheel Styles Catalog, they are 17x8 ET 37

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Current:
'74 450SLC
'89 190E
'95 E420

Previous:
'94 E320
'87 300E
'73 350SL
'75 450SL
'95 C36
'99 C43 55 swap