Maybe this is a stupid question. I think they are the flat little things that go from the pillar into the door (metal) and are separate from the hinges. Two are shiny steel (replaced?) and two are body color. (unreplaced.) What do they do, how much do they cost, how often do they go, why do they go, can you fix them yourself? Thanks in advance. Sorry about the barrage. I think my RR has them too.

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2002 Mercedes-Benz E320 4Matic
1995 Mercedes-Benz E320 Wagon
2005 Land Rover LR3 V8 SE
1999 Audi A8 4.2L quattro