How does one determine the new style QO three phase main breaker load center covers (Series S03) from the old style covers (Series S01, or S02)?

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How does one determine the new style QO three phase main breaker load center covers (Series S03) from the old style covers (Series S01 or S02)?

Issue:
Product Design Feature

Product Line:
QO Three Phase Load Centers

Resolution:
The new style covers have a new catalog number incorporating a Q after the M in the catalog number suffix. Example: old style QOC342MF is now QOC342MQF. The two are not interchangeable.