I fab'd up a mount for my fan and shroud (came as one unit) using a sheet metal "L" bracket on each side. I used the same 5/16" bolts to both attach both the radiator and the shroud/fan. Getting the mounting points (holes) located correctly was the toughest part - that and not scratching them after painting.
2x2 aluminum angle oriented vertically to pick up the outside of the cooling fan and the radiator mounting holes (for a pusher fan application on my '65). fwiw...
I welded 2"X1/8" starp to the radiator tanks and then used shouck mount bushing to isolate it from the core support.made fan mounts by using 1"X1/8 strap
SoCalCruising, you da man! I have the same HotRod Air (Scott Drake fan supplier) fan/shroud combo and also an alum radiator with no fan/shroud mounting points. Thanks for the tip.