Lifters in the lineout

Hey all.
I use my number five to throw the lineout ball too. Who lifts him? Number four and six?
Yup thats who lifts him
Either that or 3 and 7, there was some debate and I forget the conclusion. I went back reading for a while and those are the two option. Either 4 and 6 or 3 and 7.
Thanks. Can anyone confirm either way
Thank you Colt