cherokeev8 - you don't need to drop the tank, however the tank is held in place by the tank straps. What will happen when you remove the straps, is that the tank will be supported in the right-rear corner by the fuel filler pipe/fuel filler vent hoses, and in the front-left corner by the exhaust pipe
To clarify some of the above information.
Three different tank capacities were offered for the Taurus/Sable vehicle line - 16.0 gal (standard size tank), 18.6 gal (extended range tank), and 20.9 gal (flex fuel tank). To the best of my knowledge, at least all the Gen II SHOs were equipped with the 18.6 gal tank, as I believe the Gen I SHOs were as well.
The bottom of the three tanks are the same. It's changes to the upper tank shell that account for the differences in the volume of the three tanks. There are five separate fuel pump assemblies for the three tanks:
- 16.0 gal, analog cluster, standard range
- 18.6 gal, analog cluster, extended range
- 18.6 gal, SHO, extended range
- 18.6 gal, digital cluster, extended range
- 20.9 gal, Flex Fuel
Both the SHO and Flex Fuel fuel pumps incorporate higher-flow pumps, and the Flex Fuel different materials due to the corrosive nature of ethanol and methanol based fuels. My understanding is that the sending units were also different and calibrated based on the tanks capacity. Additionally, the Flex Fuel sender used different materials for use with ethanol/methanol fuels.
In reference to fuel tank straps, I know of only two active sets of parts numbers - one for the 1986-1995 Taurus, and one for the 1993-95 Flex Fuel cars. There may be additional part numbers, but they were superceded by the above two part number sets.
Area91 is correct - and you can buy both the tank and tank straps at most auto parts stores, including AutoZone, Advance Auto, O'Reilly's, Murray's, and likely most others.