some plastic parts can be painted over in a different (or the same) tint using SEM Color Tint paint. I've done that quite successfully on a few things over the years.
If for example you found a cover that wasn't all crispy and baked by the sun that was the wrong color and you are willing to invest in a $15 can of paint that might be a solution.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!