Replacement 6-rib SC Belt, all 05-10 M90s use nearly the same belt routing, we recommend using the 09-10 spec belt on all 05-10 4.6L 3v with the M90 Roushcharger or VMP 1.9L TVS upgrade.
This belt is very long so its impossible to find in an autoparts store, they are custom made for Roush applications.
If you are running a smaller M90 SC pulley (2.49 or 2.57) this belt works well with a 90mm idler below the SC.
VMP 1.9l blowers with 85-79mm pulleys can use the stock 75mm idler below the SC, 75mm and smaller can use a 90mm idler. The OE tensioner has the ability to take up a lot of slack.