Receiver Saubert made the decisive two-point conversion for Seattle.
Seattle staged a stunning comeback to defeat the Rams in overtime, clinching their place in the postseason.
Overcoming a sixteen-point deficit in the final period, the Seattle squad triumphed by a single point at home, notching their fifth consecutive win.
While the Rams had become the first to earn a post-season spot earlier on game day, the Seattle team booked their return to the postseason after a 24-month absence.
With this outcome, the Seattle now lead their division's standings with a twelve and three record, supplanting the Los Angeles, who fell to the number five seed with an eleven and four record.
Signal-caller Sam Darnold had two interceptions but recovered to deliver two touchdown passes, including the second score to star receiver Jaxon Smith-Njigba in the extra period.
The Rams held a 13-7 lead at half-time before Kenneth Walker III burst through for a 55-yard touchdown run for Seattle.
Los Angeles cornerback Josh Wallace then took back Darnold's initial pick for 56 yards, leading to a one-yard score by Corum on the ensuing snap.
In the final stanza, a scoring pass from Stafford to Puka Nacua pushed the advantage to sixteen points, but Shaheed ignited the comeback with a spectacular punt return.
Darnold then found Barner in the end zone, and a successful conversion forced the contest into an extra period.
Although Puka Nacua scored for his another TD in OT, Jaxon Smith-Njigba answered in kind to set up the game-winning conversion.
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