What HOA switch kit is used with pre-series K 8538/9 NEMA 1 enclosed size 0-3 combos with the rectangular opening?

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Issue:
HOA switch kit is used with pre-series K 8538/9 NEMA 1

Product Line:
Type S Contactors

Product Line:
8538 and 8539 type S combination starters

Environment:
NEMA Contactors and Overload Relays

Resolution:
9999SC2.