5/16-26TPI Thread form?

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http://secure.enginemodels.com/cgi-bin/store/perlshop.cgi?action=enter&thispage=tools1.shtml&order_id =!ORDERID!
In North America, why not just use 5/16-24 UNF/NF, or the harder to find 5/16-36 UNS/NS? The engine will look the same, and work just as well.
National Special (NS) threads include obsolete, and seldom used threads. Taps and dies are available, but sometimes have to be ordered from suppliers.
Steve R.

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Paul, check with Cole's Power Models (TX): http://www.colespowermodels.com/index.html or American Model Engineering Supply (FL): http://www.americanmodeleng.com /
Both have large collections of taps. You want a BSB (British Standard Brass) 5/16-26 tap and possibly a die to match. Cheers, RichD, nr Atlanta, Ga

Just to follow up:
I found the 5/16-26 tap and die in the BSC form here:
<www.britishfasteners.com>
It is even in my time zone ;-).
Thanks again to all.
-- Paul Schiller