73-454

I am just abought finished with the stuff under the hood, just one question regarding the air conditioning hose on a 454. The hoses that run to the condenser ( in front of Rad) Both hoses reach to the Rad . At that point there is a metal extension tube ( 12 inches in length) that connects at the end of the hose and the other end connects to the condenser. Unfortunately I am missing one of these pipes for the other hose. Is this a normal set-up if so where do I buy the other connecting pipe to complete the job.