Anyone know where I can get a HKS 50mm wastegate Flange?

[Angry7M]

I was about to install my HKS 50mm wastegate and i noticed that my manifold has a 40mm wastegate flange. Anyone know where I can buy an HKS 50mm wastegate flange so I can weld it to my manifold? I tried searching google but I can't seem to find anyone who sells it... Any help would be appreciated. Thank you