Original used mounting top nut for REAR QUARTER MOUNTED Ford power antennas used in many Ford Mercury Lincoln Mark III Models from 1963 1964 1965 1966 1967 1968 1969 1970 to 1971.  

In very good condition, with one minor scratch that I tried to show in the first picture. Hard to see but should be right of center.   IF yours is all rotted and corroded and tough to look at every time you take your beauty out to the car shows....here ya go!  More shiny for ya without breaking the bank.

There were also "kits" used for Mustang Fairlane Comet and Shelby models with rear mounted antenna that may have used this nut.   It has a C3VY-18865-A (1963 Lincoln) part number.  I could not find any break down lists of the inventory of these "kits" to be 100% certain.

Thunderbird did use this nut in a front mount application. Big Lincoln, Mercury, Shelby Mustang models used rear mount versions to the best of my knowledge.

This is not listed as correct for front mount antenna (excepting Thunderbird!), only rear quarter mount.   If you have any questions that you need to help see if this fits what you have, please ask before bidding!

I have the lower stanchion and fender reinforcement pieces list for the Mark III application as well as the antenna, in other auctions.

Thanks for looking!

USPS / Fed Ex Gnd Service,  shipping and handling in US.   Handling cost is for a new box if shown.  Actual shipping outside of US. USPS MO preferred or similar for payment if you do not like electronic payment methods. Your choice!   International bidders, please contact me before bidding.  International buyers are responsible for any and all import duties and taxes.