I'm not sure there is confusion, I have a pipe from an early LH Head to DG manufold, which is No3 in the pic ( 16mm ID one end attaches to a flange and 25mm ID the other) it's in good nick but I spotted it had a small split/cut 10mm in from the small end, cut that off to stop it spreading and you have a serviceable pipe.
I offered it to daysofthunder FOC once I saw the split just cover my postage no use to me I have a late system but it appears he wants a new one
