Two. See sources and related links below for more information.
All 2002-2008 Toyota Corolla takes 24" driver side and 18" passenger side replacement windshield wiper blades on the front.
http://www.ehow.com/how_4454148_replace-wiper-blades-toyota-corolla.html
Step 1 is to be sure you get the right replacement wiper blades. The 2000 Toyota Sienna takes 24" driver side, 18" passenger side replacement windshield wiper blades on the front and a 17" replacement rear wiper blade. Step 2: As far as installation, the replacement wiper blades will come with simple-to-follow, step-by-step, illustrated instructions.
The 1993-2001 Toyota Corolla takes 20" driver side and 18" passenger side replacement windshield wiper blades on the front.
The 2003 Toyota Echo takes 22" drivers side and 14" passenger side replacement windshield wiper blades.
The 2005 Toyota Avalon takes 26" drivers side and 20" passenger side replacement windshield wiper blades.
The 1993 Mercury Villager takes 22" replacement windshield wiper blades on both sides front.
The 2002-2006 Toyota Camry takes 24" driver side and 19" passenger side replacement windshield wiper blades.
The 2004-2008 Toyota Solara takes 24" driver side and 19" passenger side replacement windshield wiper blades.
The 2004 Chevrolet Silverado takes 22" replacement windshield wiper blades on both sides front.
The 2002 Jeep Liberty takes 19" replacement windshield wiper blades on both sides front.
Yes, the Avalons were manufactured with wiper blades, what about them?