How many cam plugs does it have I only see 2 on mine

 

Try the W203 Section. This is for the CLK W209

 

The M272 engine has two cam plugs located on the back of the head on the left (USA driver's) side. On the right side head, the ends of the camshafts are sealed by a screw-on cover that rarely leaks, and the oil centrifuge which almost always leaks.