It takes less time for you to search and research than it does for someone else to answer your easy question.
EDIT: Here is your lesson in using the internet for the day:
-Go to
www.contour.org.
-Select mods/parts from the menu on the left.
-Select Part sources from the center table
-BAT is listed as the first one, click on that and see if we get lucky.
-Download the catalog in .pdf format.
-Brake components pages 4 thru 10. Rotors are on page 8.
It says rear brake rotor is 253 x 20 mm (all cars with rear disks). It is refering to Contours and Cougars all years, but that is implied no explicit.
Now we should double check our work.
-Go back to the mods/parts menu. Pick another source, preferably one that list 'all parts' or 'brakes' in the description.
-Go to the site, go to the brake section and see what it says.
-Now you can enjoy the fruits of your labor.
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