I have a 2003 Marauder with close to 250,000 miles. The heater return uses a carbon steel tube attached to the side of the block which is now leaking and needs replaced. Ford no longer makes this tube and the after market parts I have found on line are not even close the original part. I checked the Mustang parts with similar engines with no luck. My question is are there any replacement heater tubes available or is there a fix to replace.