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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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