Finding the right belt can be more challenging than it needs to be. But NOT anymore. This is THE 7-rib belt needed for using a K24 (stock K24 crank pulley) with full auto tensioner, EP3 idler pulley and no AC.
USDM K series Water Pump Housing. This is what you need to convert your JDM K24 engine to use the USDM Alternator and tensioner setup. The JDM Water Pump and thermostat housing will bolt right up to this.