2G Omni Power MAP o-ring replacement?

[mx3baker]

I recently purchased the STM Tuned MAP sensor adapter to use with my 4 Bar MAP sensor. I figured i would buy a new O ring for it so I got the Mitsubishi OEM O ring for a MAP sensor.
After i installed it i had a boost leak only from this location. When i asked STM if this was a known issue or not, they said it was leaking because i installed the O ring dry.
I have taken it apart a few times, inspected the O ring and tried silicone grease and still have the boost leak.
Is the OEM O ring the wrong size for the Omni power? Does Omni sell an O ring?

Any ideas?

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[jdxnc]

Go to harbor freight or similar and just get a universal o-ring kit, you'll find one to work in there.