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I just did my '73 single piston calipers. Try www.rockauto.com

Clean everything to spotless, including the inside of the valve body itself. I replace the o-rings on the bottom nut, the switch and the upper plunger. I use Buna-N rings. Make sure you use something other than plain old rubber rings. You want them to hold up in brake fluid. The bottom nut...

Once the switch is loose, take an 11/16" wrench and undo the top. There is a small brass washer under that fitting much like a brake washer that I have no source for so don't loose it: Now remove the switch if you haven't already done so and gently remove the upper plunger assembly and you...

Most of the crud is going to be found in the bottom section of the valve behind that 3/4" nut as its just about the lowest spot in the system and after 35+ years, it's just gonna collect there. After the nut is off, here is what you'll have: You'll need a small needle-nose plier to GENTLY...

The following is a pictorial of how I cleaned up a proportional valve. This is for informational purposes only and if you elect to do something similar to this, you're on your own and I take no responsibility for your results (I hang around too many lawyers....LOL). This is a typical junk yard...