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The carbs come with two drain hoses per side, usually in pink:

You can replace them with different colours, or extend them so that they drain down to where the original ones did - just make sure that you use hose that's rated for fuel, and preferably clear so that you can view any blockages which may occur. You don't really want a blockage causing fuel to flow into your cylinders and then crankcase rather than making a puddle underneath your bike...
The hose used is 3/16" fuel hose - you can grab some online (eBay US, eBay CA, eBay UK, eBay AU).
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