Big Bore Throttle Body - Calibration Tips

Interesting, the version 2 doesn't even seem to be the same shape. How does that o-ring fit on the tb?
I have had two of the version 1 (stock tb and cte) no issues.

EDIT: the more I look at it, Im pretty sure the second picture is the adapter for the RBC intake manifold. the o-ring side attaches the the IM and there is still a paper gasket between the tb and spacer.
 
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