I have a 1995 E300D, body style 124 with 6.5J x 15 H2 rims 1.7in (ET 44) , part # 1244011202 and a 195/65 R15 91 H tires.

I replaced them with 7Jx15H2 ET 37
S17
part # A202401602 which are rims and tires off a off a 1998 CLK320, 35mm offset.
Both front and rear tires are 205/55/R16


The stock lug nuts are too long, any ideas/suggestions what to use?

I went to several sites, and am now more confused than ever......

I don't understand why you have Lug NUTS ? You should have Lug BOLTS ?
Should be able to get the right ones at your local dealer or The Tire Rack.

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2007 C 230 Sport.

Yes, they are lug bolts.............I'll check Tire Rack