Dumb question, but how do i know if my car has 15 x 6 rims or 15 x7 rims, I didnt see anything on the rim itself. They are factory, no upgrades or anything. Car is 88 190e 2.3 8v.

In the back side of the factory wheels there's a mark similar to 15J6H2 ET34. 15 is the nominal wheel diameter, J has something to do with the bead surface, 6 is the nominal wheel width, I don't know what H2 means, ET34 is the wheel offset in mm (e.g., 34mm).

There might be mention of what size wheels your car came with in the snow tire section of the owner's manual.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD

The factory rim size for 1988 190E 2.3 8V is 15x6

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and all of the sudden..... everything just started commin' apart !!!