Front map/reading lights retrofit

I am cosidering retrofitting the front map/reading lights in my LS. Has anybody in the forum done this? There should be two mounting screw studs soldered to the roof under the headliner, similar to the ones for the ceiling/dome light. I tried to feel them through the headliner but can’t feel anything since the material is rather thick. OTH, would the original connecting wiring be there somewhere?

TIA :shrug: