I have 4 of these Lug studs I bought for my 60 but they're not correct. They came up in the Auto Parts Store system for a Landcruiser so I'm not sure I'd they're for a 40 or another cruiser. Just bring me a beer to the meeting and their yours.
Derek, i ran in to the same issue when i rebuilt my front axle. I believe if you tell the parts guy it is for the front axle of a 81 mini truck it is the right stud.