WARNING: DO NOT,EVER,NEVER, buy, Truck tech (after market) electric window swithes. These aren't the cheapies for $12.00. Ther're around $28.00.
They don't fit. Not even close. Had to file the sides just to get it to fit in the harness connector. And then, it blew the 25 amp fuse!.
Huge POS.

Lesson learned. Buy OE.

Mercedes aren't assembled with "generic" parts.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

Probably got the wrong part. I got some off eBay that work fine, ~$25 for two. They don't have the star imprint, but they have the part# and are likely produced by an OE supplier. You can also take them apart if you're good and clean them out. The rocker plastic broke on the originals in my car or I would have done just that. Never heard of Truck Tech, & why would anyone buy a part for a Mercedes from such a place?

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)