CA Cycleworks - ExactFit Timing Belt for Ducati 748, S4, S4R, ST4, ST4S (each)Ca Cycleworks ExactFit Timing Belt for Ducati 748, S4, S4R, ST4, ST4S (each) is available to buy in increments of 2. Fitment Ducati Monster S4Ducati Monster S4R (2003 2006) with desmoquattro engine *S4R S4Rs with testastretta engine gets TB999Ducati Sporttouring ST4Ducati Sporttouring ST4SDucati Superbike 748 (2002 2003) *Some 2001 748 (see note below)Note: Price is per belt. Sold in pairs.