I recently came up with a seal kit to rebuild the 3905525 metering valve made by Bendix for 1967 - 1969 GM vehicles. I believe this valve was used on all A-bodies, but could someone confirm that suspicion? Here's a link to a disassembly article: https://www.musclecarresearch.com/gm-3905525-autopsy and a rebuild article: https://www.musclecarresearch.com/gm-3905525-rebuild and the seal kit: https://www.musclecarresearch.com/gm-metering-seal-kit-1 Are there any other Buick brake valves that people are interested in rebuilding? I've got a few other kits for proportioning valves and pressure differential switches. Odds are I can come up with additional kits.