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I don't see a need to go buy new, unless you are recovering a unknown truck or an extra set. But it is a good idea for all airbrake truck owners to remove and clean and lightly grease them, so they work when you need them.
They are on the rear only and lots are missing or frozen in place, be careful if you try to remove a frozen one it can crack the can. Get a 3/4 ratcheting box end straight not angled for applying them and it takes a good amount of pressure to get most to release the brakes.