Replacing my heater core in the 2001. Got one from NAPA and it requires me to reuse the existing aluminum tubes. The tubes have a beveled o-ring on the male end which goes into the heater core body. Went to the dealer and they say they don't make the part anymore. Anyone have a source for this o-ring? Thanks.

 

NAPA didn't have them?
Hit the local radiator shop. They should know.
If not time to get on the phone to the local hardware or Grainger, MSC, McMaster-Carr