There were 3 factory radiator options for the '08-14 LC but not sure how things went after '15 with the LA. The SRT always had the thickest unit with inlet/outlet diameter around 1.7" but still plastic end tanks. For all aluminum factory-fit options check out Fluidyne or if you have the coin Ron Davis and C&R.
I had a water pump go bad several years ago while vacationing (shaft/bearing) and HHP replaced it. When I enquired about the expensive electric Meziere they said the stocker is fine - mine was just built on a Friday. They have several factory Mopar units running on built 1000-hp LXs without issue.