This OEM horn pin fits just about every Toyota on the road from 1974 til about 1990ish. The applications are too many to list. But if your horn uses this style of pin this is likely the one. The issue with the horn not working is very typically that this pin just wears down to the point of losing contact. In rare situations its also the horn ring but only if its badly grooved.
...or you can just use a spent .22 shell AHHAHAHAH!
Part no: 84312-20011
MADE in JAPAN