Stromberg mixture parts

[k2bords]

I posted over in the Engine section but I'll stick something here too. I have moved from sea level to ~5500 msl and am interested in adding mixture control to my Stromberg carb. My carb now has a plate over where the mixture control should be, so I'd assume I have nothing there and would need the entire assembly. Does anyone here have these pieces or know where to get them?

Thanks!!