All Contiques (and Cougars for that matter) use 6x8s. 5x7s will work, and you can probably cram 6x9s in with some redrilling.

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Louis Wang
Sugar Land, TX
1998 Black E0 #3826
http://web.wtez.net/tw57472


-Louis
1998 Black E0 #3826, lightly modded