I assume you are talking about the metal line that I attached the picture of below?
If so then I would suggest starting with salvage yards and seeing if you can find a totaled vehicle that still has this intact.
If you cannot find it then you can make one out of rubber heater hose. You will just need to use Y or T connectors to bring in the other lines that you need to route this too. However, this is going to take some configuring because you are going to change between different sizes.
While this could work, it is not going to be desirable so I would try hard for finding one at a salvage yard. Keep in mind this also used in Camaro so you may be able to find one of them easier then a Firebird.
Please let us know if you have questions on this.
Tuesday, July 20th, 2021 AT 7:39 PM