You can match the actuator's length of throw to your specifec chute by the location of your mounting brackets. You may need to make one custome bracket or put a riser under them.
On my mount, when actuator is fully retracted, the chute deflector is almost straigt up (no deflection). When the actuator is fully extended, the chute deflector is just shy of fully deflected downward.
When your actuator is in the fully retracted position, mark both bracket locations that will give you your wide open or deflection of choice. With it fully extended and the base bracket in the same position, see if the extended bracket will mount in the first spot with the deflector in the fully deflected position (or your preferred spot). If it won't....you need to move the first two locations and try again.
If there's too much arc in the throw of the deflector and your actuator will hit the housing.....you'll need to make a custom bracket or put a riser under the factory bracket for more clearance. Then start over with step 1 again. It won't take you but a couple of trials and you'll have the proper locations and details figured out.
Doing it this way will have the actuator's own limit stops prevent it from trying to over extend/retract the deflector and either bending/breaking the mounts or your chute. The actuator puts a lot of force on the thin walls of the chute. I reinforced the mounting areas with a "wider metal plate" under each actuator bracket.