When I decided to go brass/copper on the radiator, they had it listed for early TJ's and YJs. The only fitment issue I had in my '05 was mounting screw sizes. So, I went with what fit to make it work. That was last summer and no issues yet.
i love champion aluminum radiators — they run cooler — but there is no doubt , the mopar oem one last literally forever, i get like 1 or 2 years out of a aluminum at most