for the XB
all i did was take off the airbox top & base plate
where the two tubes that enter it, put a short bit of rubber pipe between them linking them together.
the two pipes
that come off the top of each rocker cover, join using a "Y" 3/8" shaped plastic pipe joint
available from any local car spares place , then on the third leg of the "Y" fit a length of rubber pipe
and run it to either a vented catch can , or run the end of the pipe down so any crud runs on the floor ,REMEMBER if you do that , not towards tyre or brake disc
i ran mine down next to the oil cooler
so all the kit you need is a "Y" joint , and some 3/8" heater hose, a meter should be plenty
i never needed , jubilee clips , as the hose fit is tight on the "Y" connector
catch can & filter is optional , loads on E-bay
Motorrads post above has some good how to pics in it
Obey the principles without being bound by them.