read this thread
https://www.crossfireforum.org/forum...up-holder.html

also this one
https://www.crossfireforum.org/forum...tml#post268569

I think the cup holder design was a Chrysler thing, as the SLK320 is different.

I normally just put it between me and the center console next to the seatbelt even though I installed the cupholder between the seats.