2013-2023 5.7 Hemi & 2015 6.4 Hemi Cars
Factory belt size is 6 Rib 82.0 inches, you would purchase the 810 belt for use with the 15% underdrive pulley
2011-2014 6.4 Hemi cars
Factory belt size is 6 Rib 82.5 or 82.7 inches, you would purchase the 815 belt for use with the 15% underdrive pulley
2011-2012 5.7 Hemi cars
Factory belt size is 6 Rib 82.5 or 82.7 inches, you would purchase the 815 belt for use with the 15% underdrive pulley