Join Date: May 2008
Location: Richmond, Tx
Vehicle: LHD Black SLK350, LHD Firemist SLK55
Other Toys: Nacra F18
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So it's almost that simple - you need mounting hardware as well, and that rarely shows up on eBay - I've been lucky once with both.
You also will need your dealer to code the new bits into your car with DAS, but in general it should be less than an hour's work...
SDARS module you want is the GEN2 version, and it's not platform specific - you can use on from any MB.
NAVI is about the same, but needs to be from (off the top of my head) an E or SLK.