I think you're right, I've googled them from time to time but found very little other than my own posts about them and another post on TalkBass I think about a red one.
If you can find one, snap it up! I've had mine in constant use for well over a decade (maybe closer to 13/14 years) and it hasn't even broke a sweat. No fraying, no loose stitching, absolutely nothing! Quite remarkable really...