97 Pete 379 air tank.

I've searched online, eBay and even tried buying one through my current company. Does anyone know where I can get one. It's thE passenger side air tank that sits between the cab and tool box. Also I need an exhaust mount, it's the passenger side and its right behind the tool box. The rearmost mount under the cab that connects from the frame to the exhaust. I'm trying to describe the best I can lol. Even a universal air tank would be ok.. It's 32" long and the diameters 10" I need one soon as I need to move the truck to my buddy's shop. Doesn't matter if its new, used or universal. Thanks for any help. Also it anyone know the part number that would help too.