What SNB is needed with 499F strike hook on wood door?

The strike hook for the 499F or 954 strike is mounted with 2 each 1/4-20 screws which could be paired with 325 SNB's.
The 325 SNB's are required for use with 499F or 954 strike hook when installed on Fire Rated Wood Doors.
The 325 SNB's are optional on Hollow Metal Fire Rated doors.

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