Oops - you asked me a question mid November and I just noticed it! (I've been working too much/playing too little).
Regarding magura parts, I'm not sure I know where to get them, but I'd ask either of the two excellent trials bike shops in Canada:
the trialsin shop
www.thetrialsinshop.com/hbtrials
www.hbtrials.com I've seen a fair bit of discussion on this point on trials websites, so you might want to go there and run a search:
www.observedtrials.netwww.biketrials.cawww.trials-online.com These are the ones with a north america/Canada focus.
Best of luck!