Still not sure what the actual issue is, do you have a pucture of the trunk switch you got? It should be assembled just like the rest of them. We may just be having a symantics issue or something as well.

If you are looking at the last picture I posted in the part list those are all of the MB parts I bought off eBay with the crossfire caps on them. I did not use the switches, just the plastic covers with the pictures/wording on them. (aka take a screwdriver or other thin tool and pry the cap off the switch, you can see how they snap onto the switch by looking at the side) It didn't matter that the MB trunk switch was single sided because it is still sitting in a box in my closet. The crossfire switch for the spoiler is double sided and that's still what's in my car, it just has the black plastic cover of the MB trunk switch on it. To me it sounds like you are trying to put the entire trunk switch into the spoiler switch position. This is why I was saying if you want amber lighting you would have to find a double sided mb switch to put into that position and use the trunk cap on it. If you put the single sided trunk switch in the spoiler position I assume (if it even works) that you would only be able to put the spoiler up and never get it back down.