[Rev]

On mine , the extension went onto the valve body and then the filter attatched to the extension. The extension just took a different filter than I had originally. The pan came with the new filter supplied. I never use a torque wrench on the pan bolts. They're easy to twist off the head though, and I've done that too. I would just tighten them with a 1/4" drive socket in a criss-cross pattern, starting in the middle of each side of the pan, and working towards each end. Not too tight even with the little socket.

Rev