Hadley thread size?

Does anyone know size of the brass thread which feed each of the Hadley Horns? Their made in the USA, so I am guessing someone on here must know?
I have a customers Hadleys with me at the moment and I want to convert them to use the HornBlasters push fit elbows and pipe work etc?:smiley:
The plan is to take the threaded bits off an old set of shockers I’ve got and PTFE tape or thread lock the slightly smaller threaded parts into the Hadleys?

I believe some are 1/8" and 1/4".

should work as long as they are 1/8. I used my Shocker fittings on my Grovers and they worked Flawlessly!