Just an idea for anyone who hates paying customs duties if your purchasing from say www.newenough.com or www.parts411.com or who ever you guys use to purchase from.
Have the stuff shipped to http://www.shiphappenssumas.com/ which is about 20 min from the border. They only charge 5 bucks, then run and pick it up yourself. And if you want too, ride your bike down and bring a friend, pick up the gear and put it on and give the old gear to your friend to bring back in his car, and ride the new gear back over the border. Bam duty free.
Of course I myself would never do this because im a honest and model citizen, and I dont suggest that any of you do this because that would be ripping off the government and its just plain unethical.