I own a 1983 B7100 HST 4wd with an FEL. The engine is getting tired, and I want to buy a drop in replacement. I will buy any Kubota diesel engine that will work as a direct swap without too much retrofit or fabrication. I am particularly concerned about the bell housing, flywheel, clutch plate, etc. fitment. Please let me know if you have such an engine that you are willing to sell.