I think I'm using the right terminology, this is the horizontal trim a couple inches below the handle.

I'm still working on getting the right front fender area squared away and the driver's door piece began to come loose. It came off in a hurry. Unlike the fender piece, the little black plastic nubs that stick out to eventually attach to the red plastic inserts are in bad shape. Only two left and one of those is crooked.

Making matters odd, Pelican parts has new such trim piece for about every body panel except for the driver's door. I've not seen the black plastic pieces for sale. Attaching them could be tough but doable methinks. Might be worth it to buy a new piece of trim, around $15, and remove the plastic nubs. Or even a couple of boneyard pieces in bad shape might still have nubs that could still be used. 6 or 7 would do me.

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1986 300SDL, 362K
1984 300D, 138K

the red pieces are available on Fleabay and most likely the Pelican store