The Optronics Clearance or Side Marker Trailer Light # MC68RB you referenced is an incandescent trailer light with a bulb. It is a surface mounted light that is 3-1/2" long x 1-1/8" wide x 1" thick; I have added a link to a video review of this light for you to check out as well.
The replacement lens for this light is the Replacement Red Lens # A68RB. view full answer...
It does not appear that Thule lists an AeroBlade Edge roof rack for the 2010 or 2018 Mercedes-Benz C300. They do however list the WingBar Edge for both vehicles. The recommended crossbar length for the 2018 is 95 cm (37.4"). For the 2010 model they also recommend 95 cm (37.4") WingBars.
We Currently offer the Wingbar Edge roof rack for the 2010 C-300. The complete roof rack consists of the following parts:
Thule WingBar Edge Crossbars # TH89FE
Edge Fixpoint Feet # TH29SC
Fit Kit # TH43ZE
We... view full answer...
It does not appear that we have got a chance to shoot a video installing the # C59236 on a Mercedes C300 yet. We did install on an 2011 Audi A4 which is a similar sedan. I have linked the install video below. view full answer...