These arent impossible to find, just BLOODY expensive. I want a pair for my Duster too. Have you looked at the new TQ wheels SLT's? They make a 15x4, but I havent seen a pic of the skinnys yet. Posted about them on here a week ago no responses.
Found a pair of Fenton Gyro front runners yesterday, been looking for over a year. Not cheap, but will be on the way to me shortly.
Only one Fenton Gyro for sure - slots are small and narrow, lug pad is embossed slightly, only one ring around the outside diameter of the wheel which creates a deceivingly large, flat area. Nothing else looks even remotely like it. They're closest to the old Halibrand kidney bean gasser fronts.