If you’re trying to minimise height loss in your chiller, decent thickness round bar made flat-style like lamb/mutton gambrel with a short welded top open coat hanger type hook can be obtained from any competent s/s fabricator, you’re only talking about a wee bend either end of the leg spreader to pass through the hocks and a 90° twist plus curve on the flat bar hanging bracket sufficiently sized to accommodate your rail diameter. It’s not as if you’re going to be hanging a steer. The flat bar could be drilled to allow the spreader bar to pass through then welded into place in the middle, obviating the need for material that had to be twisted through 90°. See pic:
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