The light you have pictured looks to me as if it is a console cubby hole light, not a light for the glove box. I just checked my 68 -standard interior, console, April 03 build SJ plant, and it has no light in the glove box nor does it have a switch acuated by the glove box door to turn on a lightI have never replaced the glove box so I assume it came with no light or no switch. The light in the cubby hole of the console comes in with the dome light switch operated by each door as well as by rotating the headlight switch all of the way to left. Hope this is of some help. Trying to figure out a glove box light may be impossible if all 68Mustangs are like mine and have NO glove box light or switch at all.