M42 adapter with flange

[AlphaPeak]

I'm looking online for an M42 flanged adapter for my A77 so that I can use a Zenitar M 50mm f1.9 lens, which has an aperture pin. I haven't had any luck finding such an adapter for the A Mount. Does anyone know where I can find one to buy? I already have an M42 adapter without a flange, but this Zenitar lens' aperture blades can't be adjusted on the adapter, so the lens is always wide open.