key in buzzer

[GoMangoBoys]

We appear to be missing the "key in buzzer".   We have this connector under the glove box area.  Is there a source for these?  Is this a Key in buzzer or a headlamp buzzer?  My wiring diagram says "key in buzzer".  Thanks,

[Chryco Psycho]

I don't have my wiring diagrams here but as I recall the key buzzer was part of the horn rely on the fuse block in 70 , I know this was the case in some years as I used to bend 1 tab over so the buzzer would not work but the horn would , yellow is usually part of the dome light circuit but I could be wrong as I don't ever recall part of the dome circuit having a 3 prong plug .
Not sure where to locat the buzzer if that is what it is for as the wiring diagram you have indicates .

[Bullitt-]

 this thread may shed some light  https://forum.e-bodies.org/electrical-and-audio/11/what-is-this-relay-on-dash-frame/26527/msg301410#msg301410