You've Cat 1 pins. Bottom pins are 7/8". Top pin is 3/4".
They put a really short top link on there. The one I have is 19-29". Most all of TSC's (at least here) are 18-30". I just bought another one to go on an old 2" tool ripper from a JD M to allow me to raise it. You won't need any bushings anyway, just longer top link.
That isn't much lift. The lift on my JD 4010 is good for 860 # at the draft arm ends and lifts between 3" and 24". You might have trouble with most bush hogs. Think you'd have to get one of the cheaper, very light weight ones. The LX4 on my JD is 400 # BEFORE addition of the safety chains. Of course, you wouldn't have to lift the whole hog except to transport it down the road. Don't think you should do that with yours.
Watch geometry on those 3 points. Won't matter on something like the ballast box, but it does on things that stick out a ways. If the top link is the least bit longer than the draft arms, the lift geometry will cause the top link to tilt things connected there BACK, like trying to drive a bush hog tail wheel into the ground. This was what I ran into on my LX4. They didn't have the lift pins and bracket in the right holes. I ended up lowering the pins. This tilted the top link pin forward, actually quite a bit. It lifts fine now.
Think my dealer/delivery guy were in kahoots to get me to buy an iMatch. It would have solved the lift problem by shortening the top link. I went with a chain for the top link for the bush hog. You wouldn't want a chain with the ballast box. It could rock back and blast you in the butt sitting on the seat.
Ralph