[Carbuff2]

Yes, you are wise to replace that coolant pipe. It is commonly rusty. A SEARCH of the Gen3 area will bring up some info.

Perhaps someone can chime in regards the part number diffrence. The online Honda dealers sites DO say if there is a difference for the various points of manufacture.

HondaPartsCheap says both your part #s for the water passage will fit, and I would get the 'higher' number.

 

[Carbuff2]

Different people use different search terms. I can't remember the actual name of the coolant pipe that rusts, though the wife's minivan has several pipes that can corrode and leak...