Ah, tough break there.
You might try the classifieds here on Pelican for a single cylinder/piston. There are a lot of folks here with piles of spare parts. 
Best of luck,
Andrew
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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