Perchance, is that the little round cannister with a mounting tab and two brass spade connectors marked "W1" and "C1"?
I have a 73 TR6 as well and got this in when I was gonna rebuild to factory specs. That went out the window long ago and have no need for such. The buzzer, if that what this is, has never been installed. The label says, "AC Made in England, 1V7978803 B2"
If this is what you want, it is free to you. Just PM your mailing address to me.