I got mine from Supercheap Auto, it was about 8 dollars i think.
You can buy chrome nuts & bolts from Harley but they look to ugly and chunky. Circlip is a much cleaner look
I filed down a standard pair of circlip pliers and when I remove them, I put a peice of masking tape over half of the clip to catch the little fuckers when they fly off. Have also used Blu Tac.