proportioning valve

[Shadowv4l]

I'm not having any luck finding a NEW proportioning valve for my 1994 dodge shadow es, just did a rear disc conversion and i need the proper proportioning valve. Any help? I have a P# 4723869, not sure this is any good at this point, i work for a dealer and they can't even locate one for me.
I did however find the difference between drum and disc prop valve.

disc/disc disc/drum
split point psi slope - 500/.27 400/.43
inlet from MC psi - 1000 1000
Outlet to rear disc psi - 600-675 600-700

[Shadowv4l]

I have tested the car with the original prop valve and found myself drifting around corners, fun but extremely unsafe

[Shadowv4l]

original P# from an old Parts book 4313266

[Shadowv4l]

FOUND IT! some old guy buying up old dealer's inventory, sweet!