External Wastegate flange

[Lum]

Whats the score with flanges from external wastegates to the manifold? I know alot of wastegates come with v-band fitting but my manifold has a 4 bolt flange on it is this a common universal flange or do differant manifold/wastegate combos have differant size flanges?
I\'m thinking of buying a second hand hks wastegate which has a 4 bolt flange, just unsure as to whether this is likely to be the same size as the one on my manifold? Anybody know?