Hi Jerry, I do not know where to look for heads other than the normal salvage yards, but am surprised they would be hard to find. I have never replaced a head on a 90 series tractor, sort of curious what happened that you would need all three. Hope you don't mind me asking, Rod.
 
This tractor came in with water in the oil.Water in oil appears to be the head gasket. We sent the heads to be done and they are cracked in the exhaust seats. It was not putting pressure in radiator. Do not know for sure if this will cause any problems if we reassemble. Owner does not remember it getting hot.
 

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