Upon closer inspection of a legit specimen, I've determined that the Hurst Olds mirrors are not the same as the one's Yenko used on the select Deuces. Not only do they differ in color and plating, but rather in size. The Deuce mirrors are much smaller in scale when you compare the two side by side. Not sure who manufactured either style, but the more I get to digging, the less significant the Hurst connection seems to be.
I'm fairly confident that the hood scoop used on the Jeepster Commando and the prototype Deuce are the same, whether it be out of coincidence or something more.
Outside of that, I can't think of one single item with perhaps the exception of maybe a dual gate shifter that can be confirmed the same on a Deuce and another Hurst converted vehicle.
