Something like these cores?

http://www.mustang-unl.com/Cat_keywords.asp?CatKey=EMUSTANG&Keywords=heater+core&x=0&y=0

>Scott,
>I used an early Mustang heater core. They're
reasonably >priced, avilable at most auto parts stores
& Mustang >speciality houses, and are made of brass.
I'm running a >28# cap. You can also purchase custom
rubber end caps >that are useful in mounting the core
inside of a >housing. The rubber end caps are
available from the >Mustang speciality houses.
 
Mark S.



 
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