OK folks, first things first...the actuator in the listing is NOT overkill, and is a perfect fit. It is only 3" travel. So many people seem to think they know the right stroke length- yes they may have a working setup....but in fact you can use 2,3,4,5,6" strokes!!! It just depends on where the mounting holes are drilled. It all depends on the radius at fully open and fully closed to the pivot point. I don't know a whole lot about tractors yet but I do know a good deal of geometry. If you get the correct hole locations on the chte and deflector you can make any stroke reach full open and full closed on deflector....btw fully closed is a bit extreme and a good way to clog your blower if heavy snow.
You must have guessed it by now ... but yup this is my ebay listing, I decided to design the wire harness and sell them with an actuator with correct measurements. The black actuator in the listing is upside down simply for the wire direction directing downward towards the back to relieve strain and it is also IP56 rating. I sold 2 actuator kits before this with actuators much like the second link in the fist post which were IP54 ratings and could be placed in any direction.
The weight of the actuator in the ebay listing has really no effect to the deflector, it is very light (black plastic housing- not metal). I could imagine a heavy weight on the deflector would not be good on a plastic hinge, but this thing is super light!
So, hope that helps, and clears up any confusion, but really it all depends on measurements and geometry.