Crutchfield.com is a reliable source of information on what the specifications are for virtually any vehicle's sound system.
According to their site, the rear speakers are in the tailgate and are likely to be 6"x8".
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According to the 1999 Mercury Sable Owner Guide : ( 60.6 litres / 16.0 U.S. gallons , all models )
1995 Taurus - Sable front speakers are 6.5 and back are 6 x 9
The rear speakers in a 2001 Mercury Sable measure 6 inches by 8 inches. These speakers are located in the rear deck of the vehicle.
6 inchs
6 x 8
30mm
36R
The rear speakers are 6"x9"
the speakers on the dash board are an inch (tweeters) the speakers on the doors are normally 10inch
4inch
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In a 2005 Taurus/Sable, all 4 speakers are 6x8's. not 6x9's or 6.5's