Proportioning valve for 13" Brakes: 14-Bolt swap

[RanchWelder]

Swapping my 10 bolt for 14 bolt FF rear axle.
My master cylinder and rear brakes are 1/4".

Anyone with enough spare 3/16" tubing, larger style compression nuts and/or a known good working proportioning valve, please pm or email me?

The compression valve is my main priority.
We have no bone yard here for 120 miles.
My rig will not drive more than 10 in 3rd gear.

 

[RanchWelder]

Sourced a new Master Cylinder from a 1987 1 ton with 13" brakes.
1-1/8" master cylinder piston, vs 1" for 11" brakes.

Still interested in a solution for the Proportioning valve?

Anybody has a clue as to what works, or which valve to look for, the info would be helpful too.