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What plug on surge protective devices (SPD) can be used in combination service entrance devices (CSED)?

Issue:
Product Design Features

Product Line:
Combination Service Entrance and Surge Protective Device

Resolution:
1) For Any CSED that contains a QO, non PoN load center, use the SPD catalog number QO2175SB. For the newer PoN interiors, use the catalog number QO250PSPD.
NOTE: The QO250PSPD will NOT work on any QO interior that is not the PoN design

2) For any CSED that contains a Homeline, non PoN load center, use the SPD catalog number HOM2175SB. For the newer PoN interiors, use the catalog number HOM250PSPD ONLY in a tandem position.
NOTES: 1) If the CSED is a PoN Homeline interior, but does not contain any tandem positions, MUST use the catalog number HOM2175SB.
2) If the CSED is a PoN Homeline interior that contains tandem positions, then can use the catalog number HOM250PSPD in a tandem position or can use the HOM2175SB in any position.