[Steeveedee]

I looked to O'Reilly's for a heater core ('69 Skylark) and it didn't fit, too short. Autozone offered the right size, but it was aluminum instead of brass like O'Reillys. With an aluminum heater core, you will need to be sure that you have all the grounds connected properly, and maintain the coolant. Any lack of ground, or electrolysis due to lack of ground will lead to heater core failure.