Chad - Well, you're in luck! .. it just so happens, that I have my 1937 Thermoid fanbelt catalog right here .. and the Thermoid P/N is V-98.
Now, if you just run down to your local Thermoid dealer .. I'm sure they'll have one on the shelf, ready and waiting for ya ..

img371.imageshack.us/img371/6120/thermoidfanbeltsym0.jpg

Seriously .. the good part about the catalog info is that it gives the precise dimensions of the fanbelt, right down to the angle of the belt wall .. and it also shows (if the catalog is correct) .. that the Ten, the Fifteen, the Twenty, and the Twenty two, all share the same fan belt ..

WOW, thanks guys! This board is great.

OZ, my Thermoid dealer just went out of business last week. Darn the bad luck!

I will keep you guys posted on my project! Thanks again for all of the help.

I,m not sure but it seems if I reember right that NAPA belts were Dayco made belts.