Champion. I'll do the same. Lots to learn, but I'm looking forward to it. Looking forward to a refreshed engine too!Sorry I don't know the specific dims.
I just took the pipe, wrapped some tape round it, tried it in the hole until it was a good snug fit, then did the same a bit further up the tube so once the first part is snug in the spigot bush, it was snug in the friction plate splines.....it was a case of ad a few wraps of tape, try it in the hole, add some more, try again...oops too much remove a layer until I had got it pretty close and snug.