One advice, make sure you really tighten those bolts down or else you might think your radiator is leaking. What happen with mines was, the lower plug was leaking and I coudln't see it because the radiator hose was in the way, and I was looking on the bottom of the radiator and i thought both side of the weld area of the fluidyne radiator was leaking. So I took the whole radiator back out, did a pressure test and coudln't find a leak from those area, I found some air bubbles from the lower lower plug so I a wrentch to tighten it and it was still leaking. It was tightened after a copule hit with the impact gun. The leak disappeared and it was fine. I thought it was the weld on the bottom because the coolant apparently leaked from the lower plug down the side and onto the bottom of the radiator.
On the side of the picture below, it shows the plug and the gasket I used from NAPA for the plugs.
