My experience has been this.
I ordered and it was back ordered. I finally got it. (not much wait time).
The lower slots were too narrow for the lift arm balls to slide in. Similar to the previous posted pictures. All they need it to be widened out. The bolt method seems to be the best.
I have 10 different implements, My problems arise , with the top 'hook'
when lowered, the idea is to hook it under the top implement pin. and then raise it and then you close the lower hooks.
However, all but one of my attachments have obstructions for the hook. Such as reinforcement metal. Also the height varies.
I have ordered the adapter , which can be seen in the Down loadable manual
http://www.harborfreight.com/cpi/ctaf/manuals.taf?f=form&ItemID=93691
its an additional 8.75 dollars or so.It give you the flexibility for the height differences for the upper connection. You would have to get off the tractor to align and drive the pin in.
For the money, if it works for anyone , its good. But I also have several attachments that are home made and don't have the standard with lower pins to mate to the hitch.
I hope this helps. I presently await the upper adapter and see if I can get it working.
I would imagine that when you buy more impliments that if you make sure you have them with all the same measurements with width of the lower, and the upper you wont have a problem. The upper hook is adjustable.Do you think you have room for the hook to hook under the upper pin?
Allan