1956 Roadmaster factory A/C... parts? where can I get them?

I have a 1956 Roadmaster that is a factory A/C car. I have everything except the drier. The heater and A/C were disassembled when I got the car so I don't know if any of it works yet at all. I think if I had all the parts, I could get it working to see if it is functional or not. I just don't know anything about A/C units or if there are universal driers out there that will work. If you can help, I would greatly appreciate it...

Thanks
David