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
It was agreed between them that for 654 Marius should become a candidate for a sixth consulship, Saturninus for a second tribunate, Glaucia for the praetorship, in order that, possessed of these offices, they might carry out the intended revolution in the state. The senate acquiesced in the nomination of the less dangerous Glaucia, but did what it could to hinder the election of Marius and Saturninus, or at least to associate with the former a determined antagonist in the person of Quintus Metellus as his colleague in the consulship. All appliances, lawful and unlawful, were put in motion by both parties; but the senate was not successful in arresting the dangerous conspiracy in the bud.
Marius did not disdain in person to solicit votes and, it was said, even to purchase them; in fact, at the tribunician elections when nine men from the list of the government party were proclaimed, and the tenth place seemed already secured for a respectable man of the same complexion Quintus Nunnius, the latter was set upon and slain by a savage band, which is said to have been mainly composed of discharged soldiers of Marius. Thus the conspirators gained their object, although by the most violent means. Marius was chosen as consul, Glaucia as praetor, Saturninus as tribune of the people for 654; the second consular place was obtained not by Quintus Metellus, but by an insignificant man, Lucius Valerius Flaccus: the confederates might proceed to put into execution the further schemes which they contemplated and to complete the work broken off in 633.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=22