Product review (5 stars): Right Part, Quick Delivery, Easy Install
Product was the correct fit for my Whirlpool Duet ( WFW9550WR00 - I think the R00 is just color indicator).  Original part # was W1003800, this is a mfg part substitute to 8182119.  Calling some local service/parts supplier I was provided pricing as high as $130.  Ouch!  Glad to find  this one.

Installation comments relative to Whirlpool Duet Only ( design fits many models, but there will be minor differences in opening up the machine )
1. Top Panel with controls was a bit tricky to remove, two screws near the dispenser tray, then just snaps from there, but more difficult than I would have thought.  But it does come off, just be gentle with the plastic.
2. Door removal / replacement was really the only difficult item - and that is only due to the Door Lock mechanism.  We did have some trouble taking off the door due to concerns of damaging the plastic wire housings.  The YouTube video makes a quick comment about lifting up (?) for removal, perhaps that's the trick, I'm not sure.  But we took our time and eventually got it out.  Replacement was equally tricky, we finally just quit worrying about exact placement of the plastic wiring guide and put the door on.  Seems to work fine.
3. Do use caution around the door lock mechanism.  It's easy to pop off the wire connectors but be a bit gentle - wiring connectors like these are very common failures and you don't want to create a new failure by fixing the bellow.  The unit will not work unless the door lock mechanism works.
4. Be sure to tighten down the rubber seal holder properly - other reviewers have indicated they didn't tighten enough and still had some leakage.  ( I did not encounter that issue )

But really the replacement is very easy - probably need a second person to help with the door removal/replacement, but otherwise it's a one person job.  We did it in about 45min to an hour.  Good product, easy to get here online in a day or two and easy to install yourself.  I'd guess this is a $300 job from a service tech.