removing covers on lower unit?

[Rok]

I have a 1987 Evinrude 88hp v4 crossflow. I am trying to get the 2 horizontal plastic looking covers that bolt together at the top of the drive shaft area. I removed the 4 horizontal screws on the transom side and they seem to separate a bit, but they will not come off. Is there some hidden bolts? Do you have to take the lower cowling pan off first? I don't want to crack them. The parts breakdown picture only shows the 4 horizontal bolts, like it should just separate the 2 clam shell pieces. Any help would be greatly appreciated. I need them off to get a bit more room to add a grease fitting to the top area of the vertical swivel tube.