I'm embarrassed that I don't know this and that I didn't label/store them apart. Which of these two styles of tip adapters fits the G400 series (MAX, SFT, etc)? Right or left?

The bottom sections of both seem identical to me, but the top/ferrule-ring section is a different length.
P.S. the head is in the mail to me and I'm ready to epoxy the adapter on now so I can plug and play when the head arrives.