Yes you have damaged the cooling core with the longer fitting. I'm afraid you will have to replace it as the repairs would probably be more than replacement.
Your only hope for repair is to find a local radiator repair shop, if any exist anymore, and see what they can do. Hint: check the big volumed yellow pages under classified adds for your area.
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[B]2009 & 2017 370Z Touring Sport Autos SOLD
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