This DIY was done on a 2005 Corolla .
Purchase a 1" Vent Spacers off of Ebay , Or you can use over size nuts and a longer bolt , Kit comes with everything .
Basically this is a two person job , One person holds the hood as you switch and replace the new bolts with the spacers .
The purpose for this is if you have headers or a turbo kit by raising the hood on the back as the air flows through the front the hot air can escape easily and keeps your motor cooler in the summer time.
More DIY at www.corollacarclub.proboards.com