kmdsid

I've looked on Ebay many times. No luck finding a W213 spare for 18" rim. I was told on this or another forum that a 2012-2016 E400/550 would work. Can't find one yet. Still checking ebay on occasion. Most of the rims I see are 17". Just hoping the dealer in MA comes through. I'll call him back in a month or so.

Streamliner

I am not positive on this, but when it comes to temporary spares, I believe that for a class of car, they are pretty much all the same. I don’t think you need to worry about 17” or 18”, but again, I’m not sure.

threeMBs

Uninformed advice. They absolutely are not the same and are car's brakes clearance dependent.

All the info required on the topic is here: https://mbworld.org/forums/e-class-w...ml#post7461647, posts ##27,37 & 39.