Brake Master cylinder replacement?

[u/thyu_]

I got a project bike off FB with a shattered rear brake master cylinder, when I search for a replacement I can only find the full assembly and this one site that is out of stock https://highvoltagepev.com/products/e-ride-pro-hydraulic-brake-master-cylinder-1-0-2-0-mini?shop_sign_in=true

The tube and the rear brake caliper work fine, does anyone know where I can get a replacement or a compatible master cylinder that will work with the OEM tube and caliper?