Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
This did not at all put them on a footing of equality; the plebeians in the senate did not become senators, but remained members of the equestrian order, were not designated -patres- but were even now -conscripti-, and had no right to the badge of senatorial dignity, the red shoe.(13)
13. Cf. I. V. Prerogatives of the Senate
Moreover, they not only remained absolutely excluded from the exercise of the magisterial prerogatives belonging to the senate (-auctoritas-), but were obliged, even where the question had reference merely to an advice (-consilium-), to rest content with the privilege of being present in silence while the question was put to the patricians in turn, and of only indicating their opinion by adding to the numbers when the division was taken--voting with the feet (-pedibus in sententiam ire-, -pedarii-) as the proud nobility expressed it.
Nevertheless, the plebeians found their way through the new constitution not merely to the Forum, but also to the senate-house, and the first and most difficult step towards equality of rights was taken in this quarter also.
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Reference address : https://www.ellopos.net/elpenor/rome/2-01-constitution-magistrate.asp?pg=24