I have found that there were two different engines depending on the year. What year is your tractor. If you do not know, you can use the serial number to find out.
Sorry. I didn't see you serieal number in you post until now.
Using you serial number, I found that your engine is a model D283. I found a head gasket on Ebay. Here is a LINK. You may want to verify that this is your engine.
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