Okay, this is for a '70 New Yorker-- but hey, a New Yorker is really an un-gussied up Imperial! And I think the same fasteners were used on fuselage Imperials. These are used to hold sound deadening & insulating material inside the passenger compartment onto the firewall. They're made out of black plastic and are about 2" long. They sort of look like screws, but you don't screw 'em in, you push 'em in. They are designed to push in but not pull out. The first 1" is smooth, then the next inch has ribs on it (please, no jokes) designed to hold it in place. The head is a flat circular disc of plastic and has a hole in the center. Anyway, I was removing some of this padding and broke a couple of these fasteners. The autoparts stores here ain't got 'em. Anybody have any? Or know of a source for them? Muchas gracias, Mark M