f-85

I need a horn relay for my 64. I think it was used up until 67.

radioburningchrome

Do you have a picture? It might be the same as a fullsize.

bigoldscruiser

Unless you are trying to stay all original, you are better off just using a common type relay for the horns. These are heavily sought after and are rather expensive since they are used by several GM cars including GTO's.