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What is the -5251 suffix on QOU breakers?

QOU breakers

Found a Square D document (48840-208-01) about a -5251 suffix, but no other information on it

The -5251 suffix is for 10-60 A QOU breakers, and it is a threaded mounting foot, similar to the -3100 suffix that we use now.
It is obsolete, and the customer should use the -3100 suffix or order the standard mounting feet (QOUMF1 for single pole, QOUMF2 for 2 pole, or QOUMF3 for 3 pole).
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