I think someplace like quadratec used to sell them a long time ago. Basically it was an "A" shape with feet on the bottom and punchouts on one side that you bolted to the floor. You could easily make one. I will eventually, just no time or energy right now.
Side note...The dummy pedal or the area their off, is a good indicator of how the miles got on. If its never used then usually they have done more city driving, if its worn then it usually is more high way miles...
I find the location of where the dummy pedal would be on my XJ would be is not very comfortable for the long drives.
i'd kind of like to have a 6-8" step right next to my door just in front of my seat to prop my foot on lol, i would kick it every time i got in and out but it would be comfy on drives!