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OSHA 4-Bolt Column Requirements and Pre-Engineered Buildings

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Has any one determined how the new OSHA 4-bolt requirement for column anchoring (Federal Register 63:43451-43513) will be applicable to the metal building industry?   Specifically for the primary frames?  Historically, most of these buildings, at least the small to mid-size ones, have a two bolt anchorage, with a light baseplate.
It appears that the MBMA was represented in the proceedings, but I cannot readily see where their products are exempted.
Thank you
Mark D. Anderson  PE
Anchorage, AK