New copper/brass rads, are they made like the old ones? Answer's inside.

That's certainly possible, but this one is brass and copper...it's just that everything is thinner. The fins are like paper. The side panels are simple sheetmetal without any of the molded-in reinforcements the Chrysler version has.
I'm sure there are more than one manufacture and the company ordering the radiators set the specs they want. The company that built the plant where I worked was called "Blackstone", they built radiators for the Chrysler Corp. in the 60's and when I worked there they had a catalog showing what original radiators were still available and in stock.......that was about 20 years ago.