Good luck fining one in the US, and if you do, you will pay $$$ for it. They are available from sellers in the Middle East, who advertise on Instagram, but also $$$. I have sucessfully repaired pin hole leaks in my stock one twice with JB Weld. If it ever fails spectacularly, I will get it re-cored by my local radiator shop. If you find something aftermarket off the shelf in the near identical dimensions please let us know. I'm sure one of the aftermarket aluminum radiator manufacturers would make one to stock size, but also going to be $$$.
I tried mounting a "regular 40" radiator and bracket when I pulled out my stock AC and put in Vintage Air. Nothing lines up, and it was less work for me to make a custom condenser bracket for my stock radiator than try and make the "regular 40" one work.