The thicker one is probably a viscus fluid type while the original on the tractor was a rubber cushion style.
I would use the new one from CIH.
There were things upgraded from the first production models. the woodruff key was made longer with steps to keep the key from sliding out of place while installing the pulley. If it comes out of place it will crack the new damper pulley. There was a thin sealing washer added between the pulley and the oil pump to keep oil from leaking between the crankshaft and pulley. There was a plate added to the front to keep dirt from being blown back into the seal by the fan.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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