Radiater mounting Stands (Tube Chassis) HELP!

[598 BIG RAT]

I bought this car with these Radiater mounting brackets. The problem is i dont know what radiater to use with them. The with of the brackets are 21 3/4 wide and will half to be around 13" tall. I found a couple of radiaters that look like they might fit. It sure would be alot easier if someone has experience with these style brackets. The think the bolt in the top of the brackets would most likely go to the fan and shroud assembly. ( Some how)
The radiater has to lay back so it will clear the front clip. The brackets slide over a little pipe knub then it has a hole for a quick release pin.
If anyone has any info on this style radiater mounting equipment i sure would appreciate any info and help.
Thanks
R.C.

Mash that motor hard every chance you get!