This what you are looking for-
If you are in fact looking for the HEATER hoses that connect to the heater core and the heater valve, you can get some at your local NAPA store. They will not be listed as Regal or Grand National though. You have to buy some for other makes of cars and cut them to fit. These are the ones I bought to make mine. HTH ---Keith
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found here-
http://www.turbobuick.com/forums/threads/heater-hoses.267095/#post-2036863