The black and shower valves are under the coroplast out of sight. They don't have much of a rod. There is only enough to connect to the cable. The galley tank usually has a rod the extends through the frame. It doesn't have a cable.
You can buy replacement rods at most any RV supply shop.
The valves are likely Bristol made. They have a different type cable from the preferred replacement valve made by Valtera. There are replacement cables for the Valtera valve but I don't see one for the Bristol valve.
Here is a link to replacement valves and cables.
https://www.amazon.com/s?k=rv+dump+v...l_5r77je3kug_e