800 number tomorrow (make sure you have your VIN number handy) and he will give you the right P/N. Punch it in on fastlane.com and get it coming. You will need to tell him whether it is the driver or passenger side. In addition, go ahead and get a new gasket for where it bolts into the side of the tranny. You will need to be patient removing the old and installing the new. You can do it without having to remove major components. Make sure you do not bend the new line or you will end up "crimping" it.
Also, while you are at it, take a close look at the hose close to the cooler. If it is cracked and old/wore out looking this is a good opportunity to replace it too.

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Jim