Just did on mine last week.  Not a really bad job, I was able to pull the pan by myself, but would have been hard to put back in alone.   I pulled the pan to weld some cracking on the stepped sheet metal, so did the seals while it was out.  The parts diagram was a bit confusing, I ended up ordering the wrong ones for the back two.  I also had significant wear where they rub the inside of the sheet metal, one of the front ones was worn clear through at one spot.  Built it up with JB steel stick per recommendation on here, time will tell how it works.