R129 with W208 blinker mirror upgrade.

[TomE500]

I have a set of W208 mirror covers including blinkers and bezzles enroute to me from der Netherlands. From research completed, I understand the only difference in mounting is that the 208 has 4 screws and the 129 has only 3 hold the cover in place.

Several eBay.de sellers of the entire assembled mirrors are saying that the 1999 to 2002 SL R129 vehicle is already pre-wired for the LED directional signals and all one has to do is "plug n play"

My question for any techs out there or others more familiar with this model than I am - Are they pre-wired?

I need to know to see if this is a DIY job or take it to my exhorbitantly priced electronics toy installer to appropriatley connect to directional wiring

TIA,

TOM