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
Co-optation Restored in the Priestly Colleges - Regulating of the Qualifications for Office
Of greater moment was the participation of the burgesses in the elections--a participation, with which they seemed not to be able to dispense without disturbing more than Sulla's superficial restoration could or would disturb. The interferences of the movement party in the sacerdotal elections were set aside; not only the Domitian law of 650, which transferred the election of the supreme priesthoods generally to the people,(19) but also the similar older enactments as to the -Pontifex Maximus- and the -Curio Maximus-(20) were cancelled by Sulla, and the colleges of priests received back the right of self-completion in its original absoluteness.
19. Cf. IV. VI. Political Projects of Marius
20. Cf. III. XI. Interference of the Community in War and Administration
In the case of elections to the offices of state, the mode hitherto pursued was on the whole retained; except in so far as the new regulation of the military command to be mentioned immediately certainly involved as its consequence a material restriction of the powers of the burgesses, and indeed in some measure transferred the right of bestowing the appointment of generals from the burgesses to the senate.
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Reference address : https://www.ellopos.net/elpenor/rome/4-10-sullan-constitution.asp?pg=27