ak Diesel driver, Yes my fuel filter housing is the 6.2 square, with round fuel heater rod in it. I replaced filter, thot it was leaking, but it was not. Only reason I found heater not working was rod started to leak. Sorry it was pouring out. -O- fell out sometimes when I had it out. When I found it missing, I just checked my stock and put another -o- ring in. Since then I found old ring on ground under engine. I also had to make a bleeder shutoff rod after I broke it trying to shut off when it was already shut off. Learning experience. Most people do not do crazy stuff. So I am down to needing a fuel heater rod or resistance of one. I am confident I could find one for $10-20. I would have to make a sleeve with -O- ring grove in it. I suppose I may could find fuse and figure 1/2 the amperage and get a 110 volt one and put it in. I know clear as mud? grigsby