Transmission to Radiator Lines

[Kisner]

Went to Sears yesterday and bought a set up consisting of a crow's foot, extension, and swivel connector. Was able to get one undone but the crow's foot is just rounding off the other one. If I could find a crow's foot made like a line wrench, pretty sure I could get it off. Just can't bring myself (yet) to cut the new lines. Other problem I discovered when I took the one loose is the ends of the fittings don't match what I have. The new lines came with the ends flared, but my old ones (where they hook to the radiator) have a rounded-type flare about an inch from the end. Don't know why they're different when the lines are nearly identical in shape and length. Excuse my ignorance, but if I do cut the lines, would I not need to the get the cut ends flared? Never used a union, but is it basically a connector for the 2 ends?