Yesterday, I finally got the blade to drop on the HF quick hitch.
I had to bend one of the brackets on the blade (1/4") and replace one of the 1/2" bolts with a 3/8" bolt on the top link hook.
It looks perfect, but, there is enough clearance to use the CAT 1 to 2 spacers.
Is the HF quick hitch supposed to use the bushings??