search ebay. there is a guy out of florida we bought some from. they are epson heads. all mutohs use epson heads. they worked great. i do have the tech manuals that you arent supposed to have as a consumer but honestly since we switched to the new valuejet, i cant remember where they are. all i can tell you, is that the replacement isnt that hard. take your time pull your dampers and lines with care, and the only really thing you will have to worry about is seating the heads correctly and then doing the realignment sequence. look for the guy on here that sells propane and propane accessories. he is the mutoh man.