VM26 dripping overflow tubes.

Today I was setting the floats on a set of VM26 carbs. (clear tube method) When I noticed that the overflow tubes kept dripping. Even though the float level was OK. Come to find out all four overflow tubes are cracked below the fuel level. What can cause this? and , can thes tubes be replaced or do I need a new set of bowls? If I need Bowls, does anyone have a good set for sale?

Thanks, dshelly

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