The Jag 65 uses a different system which you could use on yours, as I don't have any of the hard plastic breather pipe. The Jags use a small section of oil resistant hose on to the fitting on the box, and then a metal or plastic pipe from there, so you could do that, or just get some oil resistant hose and just use that. (As Triumphs do.) Run it from the box up to about the level of the top of the dipstick, and then back down to somewhere around the tailshaft housing. Just be careful not to break the fitting in the box when you try to pull of the remains of you plastic pipe.