You can try and establish which type you have from your VIN,
This SLS page may help with the options.
The earlier type (Wide clear section) are difficult to separate, the later type (shorter clear section) are easier.
Read the Tech manual and some clarity may be found ! - but some earlier cars have had later tail lights fitted.
SL shop are very helpful.
Paul
(NB it is nice to provide a name and some car details in the signature section)