valve block collets and pipe

I have put all new seals in the valve block, but I am not sure which is the best way to fit the collets and pipes
Do I put the collets in first and push the pipe in afterwards,or do i put the collets over the pipe then push in as far as it will go and then push the collet in.
Also while it was stripped down my cat knocked the solenoids over .I sorted the top 5 solenoids but I am not sure which of the 2 underneath goes as to which way rounds they go.

I have sorted out the solenoids. Just need help with the collets and pipe

Good way I found was to fit o rings and push them down with the back of a drill to keep them square. then push collets in by hand then push pipe in as far as it will go. dont go too heavy on the chamfer,just take the corner off(wifes eyebrow pencil sharpener).touch of petroleum jelly on all to help fitting.