I can see several differences in your single point coupler. The handle is down when coupled, mine is up. Yours has a tubular handle, mine a flat bar. Does yours have a provision for a wire connector, I could not tell from the pictures? Is yours made by Faster?
Grapple hoses may have to be long enough for older loaders with the couplers mounted a lot higher than yours. My grapple needs the hoses longest when completely dumped. I tie wrapped a tarp strap to my hoses then to the grapple to keep the hoses from hitting the ground. They form an "S" and will stretch out when fully dumped.
Nice you were able to upgrade the bucket from 73" to 85". I knew the HD "was" available without grapple brackets, but may have been discontinued, meaning all new ones have the grapple brackets. Cost of the brackets might be cheaper than the logistics of having two parts numbers and buckets to warehouse.
That car pickup shows a lot of lifting power! Have you checked the loader manual for ballast reccommendations? I am surprised it did not lighten the rear with that lift!