C7ZB-14A088-A, Shield (ref 67 Mustang Electrical Assembly Manual, AM0018 PG30) no attaching hardware, not shown on 68 which uses 3 ea C7AB-14A163-C (ref 68 Mustang Electrical Assembly Manual, AM0023 PG32) possibly replaced by C7AZ-14A163-C as a service replacement, but the 68 fuel level sender wire application is not listed under 14A163. (Ref 75 Ford Car Parts, aka MPC, Text Section 140 pg 9-11. 14A088 is not listed in the text at all.) The top entry for 14A163 says "improvise". (Look in the library for sources as the retainer is used in other Fords, including 69-70 Shelby).
We used 3M 08008 Black Weatherstrip Adhesive to repair the retainer in a 67 San Jose, 5/67, Fastback.
Jim