I have one of these Mustangs (obviously) and I find it to be very good looking... drichard. I have done some research on the car, and have found out that noone really know all that much about them. They were made in 1990, came in Deep Emerald Green, and had an all white interior, with a white top. They also had the "Turbine" style rims(which are impossible to clean might I add) I found one site that gave the following numbers:
Total Production: 4,103
5-Speeds: 1,360
Automatics: 2,743
However, I also found a site that claims only 2,000 total were made, so I don't quite know whats up there. Also, there is supposedly a 7 Up Mustang Registry, but so far I have yet to get the "President" to email me back.
So maybe that should answer some of your questions I hope to get some pictures of my Stang that I'm in the middle of restoring up sometime soon, but if you do a Google search, you can find a lot of sites with info on them.