I just finished acquiring all of the parts needed to rebuild the Wagner brake pressure differential valve used on 1967 - 1974 AMC vehicles (part number 318 7725). I have them broken out into three kits:
Seals and springs for the valve ($13.50):
http://www.musclecarresearch.com/val...agner-amc-dist
Spring and plunger for the warning switch ($20):
http://www.musclecarresearch.com/switch-kit-amc
A combo kit that includes both ($27):
http://www.musclecarresearch.com/val...mc-dist-switch
All prices are "plus shipping". Orders can be placed directly from my web site using the online shopping cart system. Payment can be made by credit card, PayPal, check, or money order. Feel free to ask if you have any questions.
Rebuild instructions can be found here:
http://www.musclecarresearch.com/val...-amc-disk-dist