Good point Larry. I did that and got one to fitting pretty good but the storm was coming in fast and I was having to move bolt settings on the lift arm of the tractor (one side was in different holes than the other side and the back wheel setting had the bushhog lower in the rear than the front so I did not do anymore grinding. I am not sure why the FIL/BIL had the set up so out of wack but we are getting it back into a standard set up.
I did learn if you bend the ear over with the drilled hole the wash will not kick out at the bottom on hitching. I do have an extra washer on the inside for extra clearance and it will need to be pushed to the inside when connecting as you pointed out.
The reason I am going with the bolts vs keeper pins is for safety mainly. With a bushhog over the years I have had large stuff flip a keeper open causing the pin to come out.
The 7' HD mower is SO heavy (kind of good when cutting 2-3" trees) that the Quick Hitch would shift a little from side to side on the front end of the hitch so I am going to look at options to shim from side to side too. I noted the side adjusting bolts in the bottom hole is clamped on the leveling shim so I am going to get bolts for the other four empty holes on each hitch and that may take care of any shimming needs.
When the rain stops I will look at that in more details. When pushing backwards with the 8' box blade the side to side shims would help I am sure stay straighter when using it as a bull dozer with the 60 HP tractor.
After working on the side of 30 degree slopes and the full weight of the bushhog flopping from side to side on turning (one stablizer was in place) on Pat's Quick Hitch set up I think they are going to work out fine under a heavy load of the bushhog and reverse pushing box blading with our heavy 265 MF.
What is so awesome now that I have put on Pat's QH is how easy it is to get into gain access to connect the PTO or level the arms, etc. One can stand between the rear tire and bushhog now. It is now like the new 1992 Zetor that I loved so much but that my business ate about 15 years ago along with two little farms.