WTB Vacuum Shift Control Valve 1971 C 50

[G-749]

Hello all, looking for Vacuum Shift Control Valve for 1971 C 50 292 4 speed w 2 speed rear end. This unit shifts the 2 sp rear end between Hi n Low and uses Vacuum to do this. Looking for the parts and/ or any information about where to get one. Those among us that have Master Parts Manual could you look and see if there is a part # for any thing that might help me get enough info to search using a part #. All I really need is part #3, will take any and all to fix my truck. Cool weather in SC, and I need to b cruising
Thanks.
Good luck to all on your projects. 😆