I took the gauge cluster out of my 58 viking, and found my speedo gearbox wasn't ever hooked up. That explains the hissing. I have no idea how to get parts for it, as the bellows are cracked and I need to disassemble it to clean and regrease it. Any ideas for what I have? I can only ID it as a Stewart Warner, pat. 1984082.

https://drive.google.com/open?id=0B6Aw4aYru4MTaFluVE9la1hHUU0

The Pics are GED0194 and GED0195