my 99 sport has floor illumination, but no glovebox lamp that I can find. I will be looking again tonight, now that I think I know what the switch itself looks like. It is (apparently) OEM #4565022, and a google search will bring up images. it looks like it was used in a bunch of Chrysler/Dodge/Jeep applications. Considering how much unused wiring is waiting for upgrades that I don't have, I am hoping to find the wiring for this switch/lamp combo just waiting for me.
Edit- I found a junkyard '98 with a glovebox light. There is a hole in the sheet metal for it right next to the glovebox latch. My 99 does not have the hole, or the wiring, although the glove box door does have the "push point" molded into the plastic. It will take some cutting and splicing to make it work.
Jeeps make me happy.