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
The proposal, which the consul Quintus Caepio seventeen years after the introduction of the equestrian tribunals (648) brought in for again entrusting the trials to senatorial jurymen, showed what the government wished; but showed also how little it could do, when the question was one not of squandering domains but of carrying a measure in the face of an influential order. It broke down.(5)
5. Cf. II. VII. Attempts at Peace
The government was not emancipated from the inconvenient associates who shared its power; but these measures probably contributed still further to disturb the never sincere agreement of the ruling aristocracy with the merchant- class and the proletariate. Both were very well aware, that the senate granted all its concessions only from fear and with reluctance; permanently attached to the rule of the senate by considerations neither of gratitude nor of interest, both were very ready to render similar services to any other master who offered them more or even as much, and had no objection, if an opportunity occurred, to cheat or to thwart the senate.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=11