I found these great pics of an M Coupe on the Flickr page of denniske. The only thing I can determine about the Coupe from the Flickr page is that it is an S54, as shown in the tags.
S54B32 M Coupe | Black Sapphire | Black
Posted by Jeremy on October 16, 2010
https://www.coupeaday.com/2010/10/16/s54b32-m-coupe-black-black/
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S50B32 M Coupe | Porsche GT3 Orange Vinyl | Black
S50B32 M Coupe | Porsche GT3 Orange Vinyl | Black