Broken Charcoal Canister Valve

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Working on a 1972 C-10 w/ 350.

When I was removing the vacum lines from the valve on top of the charcoal canister I broke the plastic fitting the line goes on. Here is a link to a picture of it I found doing a Google search.http://i1002.photobucket.com/albums/...DSC00628_2.jpg

Are replacement valves available new or do I need to go search for one at the junk yard? I have searched online but I haven't found what I am looking for.

Thanks!