I believe the "Related Question" below specifically addresses replacing the door glass on a Taurus / Sable.
No. 2000 Taurus and Sable are the only interchange.
In a 1998 Mercury Sable : The transaxle is the transmission on your front wheel drive Mercury Sable it is located in the engine compartment , on the drivers side , bolted to the engine
According to the 1998 Mercury Sable Owner Guide : ( 16.0 U.S. gallons )
If it's like my 1999 taurus, it is located on the underside of the rear dash inside the trunk.
1999 mercury sable horn replacement
front of the motor
Replace it with new tubing.
Yes - the filter is outside the tank, which is where the fuel pump is mounted. See "Related Questions" below - The Taurus information applies equally to the Sable.
The transmission ( or in the case of your front wheel drive 1998 Mercury Sable , the " transaxle " ) is located in the engine compartment , on the drivers side , bolted to the engine
You have to learn all the new controls(??)Seriously though - See "Related Questions" below for more information about dash converter kits for this generation of Taurus / Sable and how to install an after-market unit.