I have in my possession two replacement lenses for my '64 IIA. These were ordered by my dad some years ago and never put on. The part number for one is 37H6111L which brings up a lens with the number PLB990. In the package there are two mounting screws, each with a small brass piece somewhat in the shape of a T. The original lenses are fitted with a self-tapping screw which goes into a white plastic cylinder in the lamp fixture, most of which have broken off.
My question is, how are these intended to be fixed to the vehicle? Judging by the length of the screw, it almost looks like they would need to protrude through the skin of the truck. My other problem at the moment is I managed to lose one already while trying to measure the threads which I assume are metric because they don't match a normal thread gauge. I don't suppose I'll be able to find it until I am able to improvise a replacement.