It shows it and gives a part number, but nothing more then that. What I would do is pull, "that is carefully remove" the plug and take it to NAPA to see if they can match the threads. They have a big line of those old Weatherhead fittings and I just think they will fix you up.

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Junqueyardjim
Christianity, if false, is of no importance, and if true, of infinite importance. The only thing it cannot be is moderately important. C.S. Lewis



1983 Mercedes W123 240D 4 Speed 285,000 on the road with a 617 turbo, beautiful butter yellow, license plate # 83 240D INDIANA

2003 Jaguar Type X, AWD. beautiful, good mileage,
Mom's car, but I won't let her drive it!