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Haldex makes them. Napa or any HD parts store. They are sold by # to indicate the size. Check this thread https://www.steelsoldiers.com/showthread.php?132401-M939-brake-chamber-diaphragm-problems find thread and you tube video by acme66

Spring brake chambers have 2 rubber pancakes on each side. Chambers need to be replaced or rebuilt. Do not attempt rebuild unless you know exactly what you are doing and have done air brakes like this before. Spring in chamber under pressure! Probably need to do all of them. Do the brakes...