Ahhhh the worm gear type.
Mine had nothing, so I had to make mine.
1 piece of angle iron attach to the tractor and hold the rod/lever
1 rod from tractor supply
1 stray piece of metal welded to the chute to attach the rod to.
I love this type of chute control, at one time I was thinking of getting all fancy and installing a chute motor, but after a 1/2 a season with this. I am please with it and don't want to get fancy because fancy needs fixing at times, Only thing I would do different would be to use the next size up rod, this has a little flex to it.
I like that set up,, i was thinking to notch the push pull rod so it could lock,,,or at least not spin around while yards of snow are flying out the chute