Chances are good that they are clipped in
Chances are good that the side pillar covers are in place by way of clips on the back side pushed into holes in the pillar frame.
They will most likely snap out like most other item on these fine machines.
"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan