Researched and found this thread. I see no pictures are shown of the SL55 engine cover. Mine supposedly has one. Bought the car from the original owner. He got it with only 105 miles on it and it had the cover on it when he got it new.
IMAG0889_zpsjwh8qyzk.jpg
Edit: Tried to delete post. I guess its not a SL55 But a SLK32/ C32 AMG