It’s an IKEA curtain rod end. I think it’s called Lystra. It was a joke, one of those April Fool’s things we used to do on ClubB5.com back in the day. This had to be back in like 2001-2. I remember taking pics on the AC Expressway. I had pulled the knob and found that the shifter shaft was hollow. Oh yes. The wheels were turning.
My dad machined the stainless base for me. It took a couple of tries to get it all right. Including the electronics. I blew a few LEDs getting it sorted, but eventually got it wired into the dash dimmer circuit, because that is what I do. It also took a while to find the correct color of LED, these are rather violet, not the traditional teal that was common back then.
So if you ever want to blame someone for a Pep Boys mod, well, now you know. It was a joke. We had a laugh. I still put it on once in a while when I light up the roof. May as well enjoy the old beast, right?