You can get patch panels for the rear quarter wheel well if you don't plan to use flares
https://forum.ih8mud.com/threads/rear-wheel-well-weld-in-panels-for-cut-openings.1246303/
Remove the slave and place the fork so the bearing is not in contact , then make a new mounting braket for the slave to fit this fork position , at the same time make the braket offset so the push rod is more inline
Valley hybrids have split case P-brake from later 40 series
Some 60 series h42 have , kind of a spacer on the back , so it is the same lenght as an h55 , problably to mount the crossmember at the same place for both set up