Bill "Quick Question" Jamison - I see you got a couple "Quick" answers. Just thought a few more tidbits might be helpful to you, and others.
I'm one of the worst offenders when it comes to naming things correctly, but I do try. I wanted to point out the things you called "yellow 3 point hitch hardware" are more than likely what IH called the "Sleeve Hitch". And what you call the "white painted sleeve hitch parts" is the "Brinly Sleeve Hitch Adapter". The "Adapter" part of the name often gets left off in discussions so people begin to think Brinly made the sleeve hitch parts. Other times people refer to the Brinly Sleeve Hitch Adapter as the "Brinly Adapter", which is probably an easier/better way to discuss the white painted parts.
Now, there is also one other tidbit to point out here. I don't know what to call that BIG solid pin, that inserts into the cast iron lever part of the IH sleeve hitch. It's not considered part of the sleeve hitch by IH, and it's not part of the sleeve hitch adapter by Brinly. One style of the pin is used for connecting IH Tillers, and another style is used for connecting the Brinly adapter.
(Couple weeks ago someone on there was discussing drilling a cross section hole in that BIG pin for the cotter pin, so the BIG pin itself could be used for either mounting the IH tiller or the Brinly adapter required for a plow - and yes it can be done).