1970 up valve cover breathers, 1 nipple, 2 nipples, 3 nipples.

I already have three, but I know what they are truly for. ;-)

Some sellers with errors in their listings like to hear the truth, one recent example on this site was the guy selling a cone type suregrip that was actually the much better clutch type.

If one of my 2-nipple breathers was for sale, I would list it by the original application only so any potential buyer was not mislead.

But hey, every seller is different.