So I ordered a pack of LED cab lights last fall and just now I'm getting around to installing them after I got thr 2nd 1 on I realized that my truck has 6 cab lights. All the kits are for 5. So I was just wondering if having 6 was an option or if someone installed after the fact. The ones I'm removing seem to be factory. 

All of the pickups that I've ever seen only have 5 factory halogen cab lights mounted on them. Someone else has done some modifying if there is 6 of them on there. If there's 6 lights, then you'll need to buy 2 sets of the same lights to add the 6th one to the mix.

Yeah,  buying another 5 pack.  It's for factory plugs and looks to be factory wiring,  at least on the 2 I got changed so far. Had to do some surgery to my roof.  

 

My guess is that they were installed by a dealer,  most likely a specific request from the original owner.  Guess it's true,  you can't fix stupid.