MB is the same bolt pattern ,but check the offset !You will not want a much smaller rear size maybe 1/2- 1" overall max.That won't make that much overall difference.Remember 1" overall = 1/2 " ht difference.Tire width won't make alot of difference.I'm sure you can find a nice combo.
I think if you want a nicer ride you'll need 16 or 17" wheels.