Hello,
Im new here and I need your help ppl

I have MB S350 long 4matic 2008 with factory and I love it.

I want to buy 20inch wheels but PLEASE tell me can I buy different front and rear tires or all four must be the same. Im talking about JOT.
I have a offer for front 8.5x20 ET38 and rear 9.5x20 ET43. Does it fit to my car (without problems) ?
Right now Im on 18inch wheels and that will be my winter set



Thank you for you answer