[ATTACH=full]412630[/ATTACH]
These install in 11/16” hole and use a 3/8 bolt.
I swapped the factory 1/4” j nuts in the grill/rad support for 3/8 ones.
I figured if they can take the heat of being and exhaust hanger bushing, they’ll handle the radiator temps. Just didn’t want to fully solid mount the radiator with my brackets welded to the tanks directly. We will see how long it takes to crack the core/tank 
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As far as the double plates, I hate fixing egg shaped holes and in the past I’ve had good luck with laminating 1/8” on top of .188” and not develop egg shape holes. Typically I just make a teardrop shape.
Honestly, I didn’t feel like swapping sheets on the plasma tables so I just did two layers of .188”.
Same for the design, I was being lazy and just offset the tab itself to make the double plate.
After fixing my dad’s elongated holes in his 1/4” plate tabs, ( which was a major pita) I started doing this with great results.
I also like getting the weld around the doubler plate to help strengthen it vs just a single solid basic tab.
