This link might help:

http://auto.consumerguide.com/Auto/Used/reviews/full/index.cfm/id/2327/act/usedcarreviewspecs/

I believe that only the S320 came in the short wheelbase, I've seen 'S320's and 'S320 LWB's advertised - I've never seen a SWB S500.

The coupes are even shorter though.

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Steven Harrison

1993 300E2.8 - 196K
2001 E320 4MATIC - 86K