I has looked at the seat rails, but it didn't fit.
On second look, it may fit on the top rail that slides over the stationary bottom rail. But I cannot get it to snap into place. Maybe something is broken on the rail that keeps it in place.
Its a key to the 8th dimension: do not use it if you want to avoid tasting colors for the rest of your life. Lemme tell you, the color Red does NOT taste like Cherries. More like a 4 day old Tuna melt covered in Mayo that's been left inside a sweaty gym bag of socks and stewed pomegranates.