I'm almost through putting everything back together from cleaning my IMRC's, but I have a question about the coolant crossover tube. First off I read how much of a PITA it was gonna be to remove it and it was, but how difficult was it to re-install? I was thinking about getting a rubber hammer because it didn't want to go back in at all! I also read about O-rings that are supposed to be on there, but mine didn't have any on there when I took it off. I have the part number for them but where exactly do they fit on the crossover? I've been searchin on here and the corral at work all day but couldn't find what I was lookin for. Thanks guys