The "G"'s (1973 and up) hydraulic systems are different from the earlier 337's and O-2's. The early and military cylinders are internally different in that they have a retracted lock mechanism that locks them in the retracted position without hydraulic pressure, and the later cylinders do not have or need this. This may pose a problem if used on the later model airplanes. The later model airplanes also have a hydraulic accumulator that the early airplanes do not have.
I think that you will have a compatibility issue if you use the early cylinders in a late airplane. Getting approval will be a huge hurdle.
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