I just replaced my radiator in my 97 GP SE with 3800. The radiator i got from Summit it is a CU1889 Spectra. The radiator came with the quick connect fittings for the trans cooler but my car has the inverted flare cooler line fittings. They screwed into the cooler just fine but I can't get the top line to stop seeping trans fluid. Question is are the newer cooler fittings not made for inverted flare lines? Can anybody confirm this or the thread sizes? The fittings I found are quick connect by 5/8-18 thread. I will pull it apart to see but I am thinking there is no taper inside the cooler for the inverted flare to seat against.

Will I need to convert to the newer quick connect lines?