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What is the difference in PK1MB Series 1 and Series 2 accessories?

Issue:
How are series 1 and series 2 PK1MB different from each other?

Product Line:
Load Centers

Environment:
Certain obsolete QO load centers that use the PK1MB accessory

Resolution:
The Series 1 PK1MB consists of metal clips which are screwed into the metal mounting rail of specific QO load centers. The Series 1 PK1MB is no longer available.
The Series 2 PK1MB consists of plastic clips which are screwed into the plastic mounting rail of specific QO load centers. The Series 2 PK1MB is still available as of 2/1/2018.
Series 1 and Series 2 are not interchangeable. See the below picture as reference.

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