The CC HydraMatic was available in the '56 and I think the '55 and '56 frames were very similar, especially near the X.
I'm pretty sure the '59 timing cover has the threaded holes that the 55-58 front engine mount needs, but I don't know if the '59 CC HydraMatic bellhousing has mounts for the 55-58 style rear motor mounts, so you may have to comvert from the 1 front, 2 rear motor mounts of the 55-58 to the 2 front, one rear mounts of the 59.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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