given the title includes Heater with radiator in quotes, I'll assume you mean the steel tubes in the console tunnel from engine bay to heater "core".
I have not approach their replacement yet, but I would be cautious of straight tubes interfering with shifter.
My "thinking", if the air conditioner can use flexiable hoses why not the heater?
I guess the thinking was a heater hose burst would scald, leaving marks. where an AC hose burst would suficate you with no visiblae marks
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