Drag specialties makes 2 sizes, one too big and a smaller one just the right size. For the smaller one it is part #DS-391671 short gas filter, 5/16" F.L. (the fuel line size on America/Speedmaster is 5/16) I purchased an extra filter element (which is replaceable inside the glass housing) that would be part # DS-391675 (replacement short filter element)
Info supplied by Fishercat and Jerry
You can find several 5/16 filters here,
http://www.dragspecialties.com/fatbook/1732/206
Edit: Here's another one from Reid.
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http://store.knfilters.com/search/product.aspx?Prod=81-0241
This K&N Fuel filter is perfect and allows you to get rid of the "hidden filter".
It's 5/16" barbs and easily fits between the petcock and top of carbs.
It's clear and you can easily see if you got into some junk fuel.
And only $6.38 direct from K&N.
