Though far from a perfect solution to an actual well-done U36B model in N scale, attaching these radiator flares to the side of an Atlas N U23B makes for a reasonable attempt at replicating the look of a U36B in N scale with minimal extra effort.
For more details and for printable graphics to represent the radiator screen, go to the following link.
https://theuniverseas.com/bvmodels/n-scale-u36b-solutions/