Make sure you get replacements that match the wheels’ spherical or conical seats. Most factory wheels have spherical cups. Cheaper aftermarket wheels are conical. Then make sure the threads aren’t too long that they mess with the park brake mechanism.

Do you have a picture of the wheel? I can’t think of what 8-slot wheel fits a 300SD.

Sixto
98 E320s sedan and wagon
02 C320 wagon