Hey, the muffler on my 1984 long bed pickup fell off. The pipe rusted through where it feeds the muffler and dropped. I want to order a new one with pipes through advanceautoparts.com becuase they're running a special. I was hoping that one of you guys could tell me which of these would fit -- ( http://shop.advanceautoparts.com/c3/...lVehicle=false ). These 9 were listed as replacements for my truck but they are different lengths. I don't have the truck at my place so I can't measure the length of the old pipes and muffler. Thank you guys.