The new, correct plate was delivered today.
I honestly don't know how these guys can make and ship these things for under $100 - between the cnc plasma, bending and a little welding they can't be making much on them.
Threw the adapters on to see how they fit. It's been a while since I've used a skid steer so I can't remember what kind of tolerances these should have. Should the bottom of the adapters be the same angle and mating with the bottom lip of the plate? Let's play "guess which Chinese part is out of tolerance!"
Basically I plan to cut the old brackets off my bucket and make and mount them to the adapter plates. I'll have to make a couple cross bars for the middle mount since my loader only has a single tilt cylinder in the middle.
I slightly regret getting the 1/4" plate as it's heavier gauge than anything on the bucket and it'll just add unnecessary weight. I may keep it for another implement I have in mind and order a 3/16" plate for the bucket....although I guess it's only 20 or so lbs difference so that's really not going to affect much.
Another option is to get these and just weld them on the bottom of the bucket (with a little reinforcing) and a piece of flat bar or angle on the top to form the lip. That'd save a good 50-60 lbs.