brace wire info
The bracing wires top and bottom were off the earlier model aircraft which had a fabric tailplane. The later model aircraft was metal covered and only had the V struts underneath the horizontal stabiliser.
As both the Thrush and Air Tractor were designed by the same guy you would expect them to look similar. One quick tell tale sign is to look at the vent set up or bulge on the top of the hopper. The Thrush has them on the right hand side halfway down the tank and is quite pronounced. The Air Tractor's "bump" is located centrally in front of the windscreen and is of a smaller nature.