Dan,
I had my radiator custom made by Griffin here in SC. It's mounted by sitting on a lower plate that mounts with the Rad support mounting bolts and a top plate that I drilled and bolted the the top bar of the Rad support.
I did mine a few years before this company started selling a kit that looks AMAZINGLY similiar to mine!
http://www.usradiator.com/index.php/...-radiator.html