Stephen, post a picture of your set up and the board should be able to help. Bottom line is the aluminum piping as Robin mentioned is not a wear item.
The O-rings however that seat the pipes to the core MUST be replaced and they cost pennies. You may have a car that does not have a plastic piping manifold. BTW do you have climate control thumb wheels in your HVAC control panel for respective foot wells? My guess is no and you have manual heating controls...only a guess and perhaps why you don't have a plastic piping manifold that connects to the cores two right hand side inlets. I have not seen that design but doesn't matter....the job is not that difficult...don't be daunted. You can also use the ETK as a pictorial reference. If you don't have a digital camera and you get stuck, simply borrow one so you can illustrate to the board what your problem is.
Good Luck,
George
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