Here are some side by sides of the 2 flanges:
And the 108mm flange:
The spring you see on the old flange on the left just slides off and can be transfered onto the new flange. there are 3 pieces in total to move. A spring, a sleeve and a clip. :
Now that the flange is out, you can remove & replace the flange seal. I have a seal puller, but you may be able to pry it out with a prybar or long flathead screwdriver. Just be carefull not to nick the soft aluminum around the seal. If you do, you may get leaks after you put in the new seal.
To put the new seal in, just apply a bit of grease around the outside edge and lightly tap it into place with a hammer. If you don't have a seal driver (I didn't) just use the hammer, rotating around the edge as you go so that it goes in straight. Remember, light taps in a circular motion.
Once the new seal is in, you can start reinstalling everything. Slide the new flange in (with the spring & stuff transfered from the old flange). In order to get the flange bolt started, you need to pry the flange in a bit. The threads won't engage because of the spring on the flange. Gently pry it in and then you can tighten the bolt.
Here is the pry point for the drivers side:
And here is the pry point for the passenger side. I used a flathead screwdriver slid through the hole in the block:
These bolts get torqued down to 18 ft/lbs according to the Bently.
Once the flange is in, you can install the axle. Instalation is the opposite of removal. The new bolts are bigger, so you will need a 12mm 12 point bit to tighten them down. When torquing down the new flange bolts, tighten them down to 30 ft/lbs according to the Bentey. Again, get someone to step on the brake for this one.
Now you're almost done. You just need to refill the gearbox and make sure everything is fastened down properly. To fill the gearbox, remove the fill plug located at the front of the transmission. I don't have a 17mm allen bit, so I used an old wheel bolt I had lying around and a 17mm wrench. If you don't have one either, you can do the same as me just using a 17mm wrench and one of your own wheel bolts:
Then insert a 3/4" tube into the hole and route it up into the engine bay:
From the top, you can now fill the gearbox using a funnel and the hose. As luck would have it, the ID of the hose is a tight fit on the OD of the bottle of MT90 I used, so I cut off the bottom & used it as a funnel:
Now, you are done, congrats. Total time was about 3 hours, but that included stopping to take pics.