Shower cartridge help

[vikhomeservice]

Hello, got this shower system in clients bathroom. Middle valve only regulates temperature. Top and bottom turn the water on and off in shower wand and rainfall showerhead.
Need to find 2 of this shut off valves to fix the leak.

 

[GReynolds929]

What's it say on the escutcheon under the thermostatic cartridge?

 

[Sponsor]

 

[Neil Binda]

Looks like sigma