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(on my 85) M4.2 - 1.41 X 20mm, pan head phillips, point type A, tapping screw, in black oxide. similar to this...
Thanks Joe,
I dropped the backup plate into the door, so I went to the hardware store with screw in hand and got two of those "U" shaped pieces to slide over the sheet metal. Lo and behold by the time I got home I no longer had screw in hand...now I know what to ask for