Lro is a good place and free there are also plent on car and classic. The forums are good to tho some like you to be a contributing member before posting something for sale
Post a link to Schmalex's Just bought a S111 thread. lots were commenting saying they were searching the classifieds and fleabay looking for one. Also try Classic Car Weekly, it has free ads and is well worth a shout.
How much are you looking for? got any pics?