I assume you are speaking of what Apple refers to as the "Clutch Covers". From the service manual:

Before you begin, remove

the following:

•Main battery

•Display bezel

1 Cover the keyboard with

a clean cloth or sheet of

paper.

2 Using a T-8 torx driver,

remove the four display

mounting screws.

3 Remove the display

from the housing and

EMI shield.

4 Place the display face-

down on the keyboard.

5 Pull off the three clutch

covers.

6 Using a T-8 torx driver,

remove the six

mounting screws from

the left and right

clutches.

7 Remove the left and right

clutches from the

display housing.