2004 Mercury Marauder Heater supply pipe failure

Your best bet is to visit the dealer's parts department. We don't have access to original part numbers. We go by application. Auto parts stores usually do too.

Ford is famous for not making replacement parts available after just three or four years. You likely won't be able to buy a pipe through the dealer unless it was used on newer models too. If that is the case, try a couple of auto parts stores or their web sites. Quite often an aftermarket company steps up and makes replacement parts that can't be found at the dealer. An alternative is to visit a radiator repair shop. They can often make what you need, and at a lower cost than what the original part cost. They may have a solution too to running the pipe so close to hot exhaust parts. That is likely what caused the early failure.