i rented one from Advance Autoparts that was just like that, er, very similar, anyway. its free to rent, if that makes sense. you tell them what you need and then you actually pay for it. once you're done, you return it for a full refund. the one i used had several different inserts for different head configurations. i'm surprised no one there got you the right one. well, that really doesnt surprise me, i guess. i think sometimes the only requirement to work at some of those places is a pulse.....