The radiator that I ordered VISTA-PRO 433369 radiator for $111.79 from Rock Auto -
here is the link.
Here is the three way brass valve to control the auxiliary and main tank.
Running total so far for the truck expenses:
-purchase price $1100
-starter $59
-rag joint $23
-parts ordered $402
--inner rocker/outer floor x2, rockers x2, sill plates x2, lower door skin, front cab support x2, fuel sender, shifter knob, armrest x2, dash pad, heater control switch, rear light kit
-Wheel dollies (tool purchase will not add to total since I will keep) $97
-new 3-way valve for aux. tank with fittings $28
-pvc valve and oil fill cap $16
-radiator $129
-passenger fender $60
TOTAL $1817