Five nuggets of knowledge about Week 17:
Three of a kind. Not since 1991 have three NFC West teams finished a season with winning records. It could happen in 2012 if the St. Louis Rams upset the Seattle Seahawks on Sunday. The Rams would finish 8-7-1 with a victory. Seattle and San Francisco already have 10 victories apiece. The 1991 NFC West race finished with New Orleans (11-5), Atlanta (10-6) and San Francisco (10-6) ahead of the Los Angeles Rams (3-13). Also with a victory, the Rams would become the second team since the merger to post an undefeated division record without qualifying for postseason.
Making history. The Seahawks have never finished a season ranked first in fewest points allowed. Seattle enters Week 17 having allowed 232 points, fewest in the NFL by 21 points. Chicago has allowed 253. The 49ers have allowed 260. Seattle has allowed 17 or fewer points in its past four games, the Seahawks' longest streak since 2003 and 2004.
The Rams' Jackson needs 10 yards rushing for his eighth consecutive 1,000-yard season, which would tie LaDainian Tomlinson and Thurman Thomas for fourth behind Emmitt Smith (11), Curtis Martin (10) and Barry Sanders (10).
Seattle's Wilson has 25 touchdown passes, within one of Peyton Manning's rookie record. Wilson, with a 98.0 NFL passer rating, also has a shot at breaking Matt Hasselbeck's single-season franchise record (98.2).
Smith, with 19.5 sacks, needs three to break Michael Strahan's single-season record for sacks. Houston's J.J. Watt (20.5) is nearer the record, however.
Stopping the bleeding. The 49ers have been outscored by 50 points and allowed more than 700 yards over their past five-plus quarters. That is nearly as much yardage as the 49ers allowed over a 12-quarter stretch of games against Chicago, New Orleans and St. Louis. The trend is about to end. The 49ers' Week 17 opponent, Arizona, has 735 yards in its past four games. The Cardinals' Brian Hoyer is making his first NFL start at quarterback.
Crabtree's time. The NFC West is in danger of finishing without a 1,000-yard receiver for the first time since the NFL realigned into eight four-team divisions in 2002. The 49ers' Michael Crabtree needs 67 yards against Arizona to become the team's first 1,000-yard receiver since Terrell Owens in 2003. Arizona's Larry Fitzgerald needs 215 yards to reach 1,000 for the sixth consecutive season. Seattle's Sidney Rice needs 252 yards for 1,000. Crabtree is averaging 91.5 yards per game since Week 13, sixth-most in the NFL.
ESPN Stats & Information contributed to this item.