I just replaced all my idler pulleys and accessory belt, I tried the 100" belt and it's too long. I needed a 98" belt and after talking to some others, I'm not the only one. K060980 for Gates or 980K6 for Dayco. I also noticed that the idler pulley closest to the passenger side is not listed, I cross referenced it to 89051 for a Dayco pulley.
2003 Black - sold, back again, and sold
2003 DBP/DC - #153 Whipple 3.4 (permanent garage art)
2003 DBP/LF - # 36 (sold)
2003 DBP/LF - # 205 (sold)
2004 Black - Trilogy #43
2003 Black - shitbox (sold)
2004 DTR - shitbox #2