Momentum- my assumption is that you have a W124 model and not the 500E/E500.

If so, then 17x8 ET34 is too wide for the fenders, and you will get lots of road-spray onto the fenders & lower panels of the car.

I had 500E 8-hole 16x8 ET34 and 17x8 ET34 wheels on the W124 wagon, and although it fits, just too wide of wheels with that offset.

Best of luck,
:-) neil
1988 360TE AMG
1993 500E