Originally Posted by sk8boylou
do you get the gates timing belt kit for 02 - 03 wrx or 04 - 07 sti?
only difference in the kits are the idler pulley to fit the bolt length that came on the stock idler pulley. You can get either kit, and get a new bolt from the dealer if the idler supplied is wider. IIRC, the 04+ idler pulley bolt is a few mm longer than the 02-03 bolt.
FWIW I matched everything as 04 STi since the parts design superceded anything designed during the 02-03 years.