The oem 2 years bumper to bumper are about $9000. This warranty extension is only for the 4th and 5th year only.
Correct. While I have a learned you cannot negotiate the MSRP on the car, everything else is free game. I did not pay close to that.
So only available at the time of initial purchase, or can add it anytime before the factory warranty runs out?
In France you can indeed - I bought the extension just before the end of the 3-year initial warranty. The condition is that the 4th / 5th year warranty must begin right when the 3-year warranty ends, so you have to buy it before this time.