Your best bet would be going to swap meets. They do have a casting # that identifies them as GT-40's. Just dont take some ones word that they are. Or you can buy the P's on e-bay for 600.00 plus. Good luck.
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Edward VanCura, Amsoil dealer. For information about amsoil synthetic oil and lubes leave me a message. Ask about preffered customer program and buy at dealer cost.
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