Post June 1998 cars have larger front brake discs which require 17" wheels as a minimum. Stock size, as another poster has mentioned, was 8.25J x 17 ET 34 fitted with 245/45 R 17 tyres. Smaller 16" wheels, which were used prior to June 1998 will not fit. I too have a full size 17" rim fitted with Michelin tyre in my spare wheel well, but it is a black-painted cast alloy spare wheel, not a match for those on the car.

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JJ Rodger
2013 G350 Bluetec
1999 SL 500
1993 E300 diesel T
1990 190