Learoy, I know you're looking for a new grille for your SL. There is a bonnet and grille offered together on UK e-bay at the moment. This is the link:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=10398&item=2485191292&rd=1
It is still pretty expensive.
(I would pm you but apparently your inbox is full.)