I want to replace the fuel injectors on my 1995 e320 Cabriolet, but I can't figure out how to remove the rail. It appears to be bolted onto the engine block and sandwiches the intake manifold. I can't figure out how to get to that last bolt near the firewall. Is there a trick to this? Also, I assume I have to remove the rail before I can remove the black plastic cover that is on top of the fuel rail.