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How does a panel interior mount in an MH74D9 Enclosure?

Issue:
Which end of an MH74D9 enclosure does the  interior correctly line up with? The mounting studs in the *D9 box are not symmetrical as a standard 5.75" deep box.

Product Line:
Panelboard Enclosures

Environment;
Installation

Cause:
How to mount the interior

Resolution:
The end with the two brackets is the main breaker/main lug end. 
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