Can a NF panel with factory installed 400 amp main breaker be converted to a main lug panel?

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Issue:
Can the NF panels with 400 amp main breaker be changed to a main lug panel?

Product Line:
Panelboards

Environment:
NF Panelboards

Cause:
Repair parts for older Series 0 or no series NF panelboard interiors.

Resolution:
Effective 2014, these parts are obsolete and no longer available. They were parts for the Series 0 or no Series NF panelboards. They do not work in the current Series E1
NF panelboard.
There is no replacement for these parts.
(1) 80113-270-50 Barrier Assembly - Consider a sheet metal fabricator custom make something to replace it.
(1) NALM4 Main Lug Kit
(1) 80103-079-02 Closing Plate
(4) 21593-17080 Screws