25. As mentioned in our opening text, Old Air Products offers plenty of custom hardware in its catalog; including aluminum tubing, stainless braided line material, and even threaded fittings you can weld on to your own gear. In our case, we took the factory modular A/C manifold and marked where it needed to be cut down and have the ends welded on. We then shipped it off to Old Air Products for modification. We also ordered bulk hose and end fittings so we could make our own hoses, as an engine swap such as this means no direct fit hose is going to work.