x2 bring the old one in with you (or buy both and return one)
You can bend them by hand, just don't kink them. Only bend them once, multiple bends will make it brittle.
Juntions rarely fail.
Make sure you hit everything with some PB blaster before you try to loosen anything.
"Flare wrenches" are handy to have if you want to throw a couple bucks at a set.
Flaring brake lines is an art that takes practice and gives you great pride or a heart condition.
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