A forum member over at GJ had this NOS GearWrench driver set for sale. Looked unused, except didn't have the bit assortment. That wasn't a problem, as I have tons of bits. But I had this what looked like a matching stubby driver handle, and after some back and forth we agreed it should interface with all the extensions. For $25 shipping included, I took the chance.
Lo and behold, the stubby driver interfaces perfectly! Now all I have to do is cut some drawer liner so the stubby will fit in the bit assortment cavity, and I'm GTG.
Sweet set, clean and nice looking!