Mick_C

G'day mate,
Best bet is Sydney based "Western Filters" they sell genuine Provent 200 catch cans. Here is the link to their Patrol kit --> Nissan Patrol provent catch can kit

and the general page ==> Provents kits
pricey but less hassle to chase everything yourself when only getting the catch can.....and last thing you want is some home made attempt which may or may not work. I fully recommend the unit I have one and everyone else with Patrols I know has.
There is this unscrupulous mob which sells Chinese knock offs via various 4WD forums for slightly less but bear in mind they're getting those from Chinese supplier for $15-20 each while they increase the price to you ten folds and you are still getting a fake. I'm not mentioning the joint but they also stir the pot in performance chips and tuning with wild promises,they steal ideas from others too like reselling Darren Dawes boost controllers as their own or claim inventions as their own.
Regards