I have the ZiS-150/164 wings by Armor 35,bought them a month ago from Russia(I think Armor 35 is now re-issuing them because of previous production run being expended).
The casting is very high quality, the resin is gray and looks like styrene.
The ZiS-150 Wheel set was available when I ordered the Wing set, but it was a bit pricey for me(there is an alternative, that is more affordable).
The PE set is brand new.