My girlfriends old man just bought an old diesel Peugot as a beater car, and wants to do something about putting a block heater in it. He didn't think he'd have much luck finding something that would fit in one of the factory freeze plugs, so hes thinking about getting an electric fuel heater like you would put on a big rig and installing it in one of the heater lines. Any suggestions guys? I'm gonna check at work tomorrow to see if we have anything in our catalogs, but I was also wondering if a bmw, mercedes, or VW block heater would fit. Sorry, I havn't had anytime to look at the car, I don't know what model, year, or engine it has, I just know its got a diesel in it. And since its just a beater, I don't think he wants to spend a whole lot on it.