Daughter's 69 Charger RT w/AC sprung a leak from the heater box so attempted to pull it. Unable to separate copper firewall pipe from box, so had to cut the pipe and hack up the box to remove it. Fortunately had complete AC box out of 70 Satellite. Did a pressure test and it leaked from the core, so ordered a commonly advertised aftermarket unit. Don't know if same one Classic sells, it was a nice piece and physically fit, however the tubes did not line up properly with the bypass valve and the copper tubing to the firewall. Returned the repop and sent the core to Glen Ray.