If you have a *single* finned pipe, visible through the openings under the front bumper, that's the power steering cooler.
The OEM tow package has a similar finned arrangement with *two* pipes; one for power steering, one for the transmission.
Like 12Ounce, I reused the seal in the tranny. I decided it's a better move to risk the filter when wrenching the new seal off, rather than messing up the tranny trying to pry the old seal out.