OK, I figured it out!
I'm going to use the Koolance block I pictured above and get a piece of copper plate 1.5" x 4.5" and 3/16" thick from online metals, and I'm going to cut it to be exactly like the plate that comes with the motherboard only a little longer. I will then use Arctic Silver Thermal Adhesive to adhere the block to the plate.
You guys think that will work?

Thanx, Lee