I don't think it's in the bumpers. The FAQ that lists the locations of the figments was originally intended for the Playstion 2. The colors listed may be off, too, depending on what platform you're using.
I also couldn't find that one figment. It's not in the bumpers. Try looking in the tubes and ramps in the area. I wish I could be of more help but I didn't write down where I finally found it. Sorry!