Yeah, I had this spare set of cracked & discolored headlight doors, so I decided to paint them the body-color. I'd seen one or two other W123s with the same mod. Wonder if the W123 would've sold if they had been facelifted with body-color plastic bumpers. Around here, there was a metallic blue 240D a couple years back, that had body-color headlight-doors AND molded-fiberglass bumper-skirts front & rear. It looked kind-of tacky. I didn't know bumper-skirts even existed for these cars.
As for more practical mods, last year I upgraded my TD to a 100+ amp alternator. Only because mine had quit and a friend had already given me this oversized Bosch unit - so I thought "Why not".
Had to run a heavy cable to the starter terminal for the larger alternator's B+, and fuss with the bracket a bit, but ultimately it bolted right in.

Happy Motoring, Mark

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DrDKW