My seat riser, only has one hole where each "bracket" would go. Perhaps my holes aren't really factory seat attachment at all? It's hard to say, as when the conversion was done on my panel, lots of changes were made. I have a '54 heater for instance!
The passenger seat in my bus, being another driver's seat, slides back and forth, as well as flipping forward/folding. It works pretty good, although I have so few passengers I don't know why I even bothered putting it in!
