JDM K24A engines with RBB cylinder heads have become commonplace for our engine swaps, as they are virtually identical to the 2004-2008 USDM TSX engines (K24A2).  While the engines are the same, the water pump, water pump housing, and alternator are different. Since the JDM alternators can't be purchased in the U.S., we recommend converting these accessories to USDM spec.  To do so, you'll need this USDM K24A water pump housing. Combine it with a USDM TSX alternator, water pump, and EP3 idler pulley and you'll have all of the OEM parts needed to install a JDM engine per our installation guides.