Re: Outside rear view mirrors
Not directly related to your question, but close enough that it may help you out at bit (or not).
I have a 2014 Overland and my passenger side mirror under lamp (puddle lamp, what's the technical name for it?) has gone out. Took it to the dealer and they could not find a part individually to replace it. They had to order an entire new mirror, which is on backorder.
Leads me to believe that if it's pre wired, you may have a hard time finding just the bulb to fit in there. It could be pre wired up to the mirror, and then depending on the mirror type, the wiring ties in?