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Coming up blank here....Need to know the Ford part # for the captive nuts that the two taillight screws thread into. Also need the ford part number for the taillight screws as well. For a 1976 F100.
56000-S .. Pan Head Screw-Tail Lamp to Quarter Panel / #8 -18 x 1 1/4" long / Obsolete
GREEN SALES CO. in Cincinnati OH has 143 = 800-543-4959.
Captive nuts not pictured or listed in the parts catalog.
Same tail lamps, mounting hardware and sockets: 1974 F100/350 Stylesides from serial number T80,001; 1975/79 F100/350 Stylesides; 1975/91 Econoline; 1978/79 Bronco.
If by when you say "CAPTIVE NUTS "
are you talking about the U Clips?
if so you should be able to get them from your local autobody supply house, or from an Auto parts house and even at a hardware store.
take one off your truck, take it with you to compare.
here is a link to a place that specializes in restoration hardware.