There is a trident and rIII forum in another web site. They are very helpful with info [not that here is not good, just they specialise].
http://www.triplesonline.com/
Also:
Triple Cycles - Phil Pick
Tony Hayward
Norman Hyde
all good triple specialists, but all in GB, so its mail order.
Easy though, email what you want, phone with credit card details, and parts arrive in about 4-7 days.