H3 5.3 downpipes exhaust flange

[humvee]

Hi, I have a custom exhaust setup going for my downpipes because I could't find the correct flange (that bolts to the manifold).

Question is: Can someone help me identify which exact 3 bolt flange I would need to fit the stock alpha manifold?
There seems to be quite a few variations, and the last set Amazon said would fit didn't.

A weblink would be extremely appreciated.

 

[humvee]

Can anyone confirm if this gasket is the right size? Its a 2.5" 3-Bolt Header Manifold Down Pipe Catback Turbo Exhaust Gasket Flange.

Autozensation 2.5" 3-Bolt Header Manifold Down Pipe Catback Turbo Exhaust Gasket Flange 1PC https://www.amazon.com/dp/B07S7Y3XS5/ref=cm_sw_r_cp_api_i_t8AxDb60MZ29T

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