Normally one would cost effectively wrap chrome window surround and it is reversible however, if you are so inclined there is OEM anodized CLS63 black night trim available: front door lower window left 2187200501, right 2187200601; rear 2187306700, 2187306800; top 2186908100, 2186908200 shown here. To comparison shop begin here https://www.oediscountparts.com total $730.50/free shipping (no affiliation).

 

Is there a part number for the trim on the rear trunk lid?

 

No, remains chrome.