The metal two inch receiver hitch bracket had to be purchased separately. The electronic hand control came with the unit. There are two seeders offered - one manual and one electronic. The electronic comes with the necessary components except for the metal receiver hitch bracket.
if I had the time, i would build a mount that slides in the holes along the sides of the back bed. I know a guy who did this. 2x8 flat across the bed and another 2x8 bolted to it upright (with strengthening brackets) to mount seeder to. You dont need the receiver hitch bracket if you do that. The advantage is, it puts the spreader up high above the weeds. If you are doing a throw and mow, the receiver hitch bracket has the spreader down low and it doesnt do well at all spreading through standing weeds. Bed mount puts it up above most of the seeds and it does a much better spreading job.