Is there a flexible fitting which connects to the condenser drain on the factory air?

RedFish said

Do you have the correct firewall for factory a/c build ? They aren't the same.

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My car is originally a non-A/C car, so I have had to modify the firewall to accommodate the A/C heater box (enlarge blower motor hole, add holes for mounting studs, plug one of the insulation nail holes).

So far, the only hiccup has been getting the condensate drain tube to line up and penetrate the firewall.