1971 gmc 5500 power steering cylinder hunting

[Slednx]

Hey so I’ve been trying to track down a new power steering cylinder for a 1971 gmc 5500 dump truck. There aren’t much in the way of numbers on the cylinder but there are a few letters stamped on it. It currently works but leaks all its fluids out of the ram in about half a day when being used all day.
I can’t find any info on it other then in an old truck and diesel repair manual and it’s telling me what type of cylinder it is but that’s about it.
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