I sort've upgraded my radiator, i have an 2002 gt, and took a radiator from a 98 gtp which was about twice as thick.. the tranny line connectors that screwed into the radiator were bigger on the stock radiator than the 98, so i used a pick to pull the small clips outa the connectors. and swapped em. thankfully it worked. there would be more clearance with this radiator.. but my core support for the radiators bent in :P so i still only have enough room to slide my hand down in there.
didnt need to do anything different than the tranny line connectors. everything else was where it needed to be