since my picture fails, I'll try to explain the diagrams...
the J-tube in this first diagram connects to 19 on each side in the 2nd diagram. it connects near where the label for 15 is. there's also a bolt that connects the J-tube to the cooling tin, at a tab about 1/2 way down the J-tube.
in this pic you can see where 12 connects to 13, but the other end of 13 is where the flapper box goes. from the flapper box is another flex hose to the cabin. ( I don't have these yet so my pic wouldn't show them yet)
the front part of piece 19(where the #18 piece goes, too) is where it connects to the front shroud. piece 16 and 18 go on the top to lock the warm air guide to the H/E.
each side is the same
btw, I'm looking for a 2 port heater blower like the top diagram shows... pm me if you have one.