I'm servicing my truck (2006 2500) right now and pulled the fuel filter out. Went to get one from my box from Genos, and it's slightly different, the end with the hole in it is a smaller diameter than the one I pulled out (2nd change, 20k miles) and the only way the new one will go in is to put the closed end into the "teeth" to hold it up, then install it, the open end is on the bottom now. I can't frigging remember what position the old one was in, I got "CRS" :-laf Is that a problem?? or am I just freaking out over nothing? Still runs fine, just curious... ... ... .