I have recently purchased a 1967 Starcraft with a 120 outdrive and a 120 Mercruiser motor. Today I pulled the gimble bearing and have a few questions. I have seen bearings pulled but all it has been was the beaerings. In the pics below I know that D is the bearing itself. I am guessing that A and B are shims to install C, just not sure what C is. Is what I am saying correct? Also do new gimble bearings come with all this stuff?
Here is a pic for anyone that needs it without the lines and soforth.
Thanks for all and any help in advance.

Here is a pic for anyone that needs it without the lines and soforth.

Thanks for all and any help in advance.