Rams fullback Tom McCormick, leg high in the air, dives headfirst over the line to score early in the first quarter of season opener against the Forty Niners before a capacity crowd of over 60,000, Sept. 25, 1955, San Francisco, Calif. The Rams had already made two points with a safety. Others, from left: 49er Tackle Leo Nomellini (73) and Rams linesmen Duane Putnam (61), Frank Fuller (71) and Bobby Cross (73). (AP Photo/RHH)

Hugh McElhenny (39, with ball) of the San Francisco 49ers, goes for nine yards around right end on pitchout against the Los Angeles Rams, Nov. 8, 1959. Moving for Rams are backs Jack Pardee (32) and Les Richter (48). (AP Photo/Harold Filan) 

Forty Niner fullback J.D. Smith is swarmed by Los Angeles Rams players as he tries for an around-end effort in first quarter between the two National League teams at Kezar Stadium, Oct. 2, 1960, San Francisco, Calif. Smith made a two-yard gain on the play. Identifiable Rams are Don Ellerslic (44), George Struger (77) and Jack Morris (40). (AP Photo)

Los Angeles Rams running back Dick Bass (22) carries the football during the Rams 17-7 victory over the San Francisco 49ers on November 12, 1961 at the Los Angeles Memorial Coliseum in Los Angeles, California.   (AP Photo/NFL Photos) 

San Francisco 49ers running back Don Lisbon (42) carries the ball with Los Angeles Rams defensive backs Charley Britt (17) and Eddie Meador (21) closing in during a 28-21 Rams victory on October 27, 1963, at the Los Angeles Memorial Coliseum in Los Angele (AP Photo/NFL Photos)

Los Angeles Rams running back Henry Dyer (35) carries the football and scores on a 1-yard touchdown run during the Rams 24-10 victory over the San Francisco 49ers on October 6, 1968 at the Los Angeles Memorial Coliseum in Los Angeles, California. (AP Photo/NFL Photos)

Los Angeles Rams wide receiver Jack Snow (84) catches a touchdown behind San Francisco 49ers Hall of Fame cornerback Jimmy Johnson (37) during a 20-6 Rams victory on October 11, 1970, at the Los Angeles Memorial Coliseum in Los Angeles, California. (AP Photo/NFL Photos)

Los Angeles Rams quarterback Roman Gabriel (18) drops back to pass during the Rams 17-6 victory over the San Francisco 49ers on November 21, 1971 at the Los Angeles Memorial Coliseum in Los Angeles, California. (AP Photo/NFL Photos)

San Francisco 49ers quarterback John Brodie (12) throws while being pressured by Los Angeles Rams defensive end Fred Dryer (89) during game at the Los Angeles Coliseum, Oct. 8, 1972. The Rams defeated the 49ers 31-7. (AP Photo/NFL Photos)

Los Angeles Rams quarterback James Harris (12) spots Lawrence McCutcheon (30) in the clear during the Rams 37-14 victory over the San Francisco 49ers on October 20, 1974 at the Los Angeles Memorial Coliseum  in Los Angeles, California. (AP Photo/NFL Photos)

Los Angeles Rams defensive tackle Larry Brooks (90) sacks 49ers quarterback Scott Bull (19) during the Rams 34-14 victory over the San Francisco 49ers on October 2, 1977 at the Los Angeles Memorial Coliseum in Los Angeles, California. (AP Photo/NFL Photos)

Quarterback Joe Montana #16 of the San Francisco 49ers throws a pass against the Los Angeles Rams at Anaheim Stadium on October 5, 1978 in Anaheim, California. The Rams defeated the 49ers 48-26. (AP Photo/NFL Photos) 

Los Angeles Rams quarterback Vince Ferragamo (15) calls signals at the line of scrimmage during the Rams 45-35 loss to the San Francisco 49ers on October 23, 1983 at Anaheim Stadium in Anaheim, California. (AP Photo/NFL Photos)

San Francisco 49ers vs. Los Angles Rams at Candlestick Park Sunday, December 14, 1984. 49ers beat the Rams 19-16. Los Angles Rams Running Back Eric Dickerson (29). (AP Photo/Al Golub)

Los Angeles Rams wide receiver Henry Ellard (80) makes a catch during an NFL football game against the San Francisco 49ers on Sunday, Dec. 18, 1988 in San Francisco. The Rams won the game, 38-16. (AP Photo/Greg Trott)

Los Angeles Rams wide receiver Flipper Anderson (83) celebrates during an NFL football game against the San Francisco 49ers on Sunday, Oct. 1, 1989, in San Francisco. The Rams won the game, 13-12. (AP Photo/Greg Trott)

San Francisco 49ers vs. Los Angles Rams at Candlestick Park Sunday, October 4, 1992. 49ers Beat Rams 27-24. Los Angles Rams linebacker Kevin Greene (91) sets sites on San Francisco 49ers running back Ricky Watters (32). (AP Photo/Al Golub)

San Francisco 49ers vs. Los Angles Rams at Candlestick Park Sunday, November 20, 1994. 49ers beat Rams 31-27. Los Angles Rams running back Jerome Bettis (36) follows guard Tom Newberry (66) through the line. (AP Photo/Al Golub) 

St. Louis Rams wide receiver Isaac Bruce catches one of his four scoring receptions during an NFL game against the San Francisco 49ers at the TWA Dome on October 10, 1999. The Rams defeated the 49ers 42-20. (Peter Read Miller via AP)

San Francisco 49ers vs. St. Louis Rams at Candlestick Park Sunday, October 29, 2000. Rams beat 49ers 34-24. St. Louis Rams running back Marshall Faulk (28). (AP Photo/Al Golub) 

Offensive linemen Richie Incognito #68 and Todd Steussie #79 of the St. Louis Rams pass block for quarterback Marc Bulger #10 during the game against the San Francisco 49ers at Monster Park on September 17, 2006 in San Francisco, California. The Niners defeated the Rams 20-13. (AP Photo/Paul Spinelli)

St. Louis Rams running back Steven Jackson (39) runs for yardage in their NFL football game in San Francisco, Sunday, Nov. 18, 2007. (AP Photo/Paul Sakuma)

St. Louis Rams free safety Oshiomogho Atogwe, right, intercepts a pass intended for San Francisco 49ers tight end Vernon Davis, left, during the second quarter of an NFL football game Sunday, Dec. 21, 2008, in St. Louis. (AP Photo/Jeff Roberson) 

St. Louis Rams defensive end Chris Long takes up his position during the fourth quarter of an NFL football game against the San Francisco 49ers Sunday, Dec. 26, 2010, in St. Louis. The Rams won 25-17. (AP Photo/Jeff Roberson)

St. Louis Rams middle linebacker James Laurinaitis (55) holds up the football after the Rams recovered a fumble by San Francisco 49ers quarterback Colin Kaepernick during the fourth quarter of an NFL football game in Santa Clara, Calif., Sunday, Nov. 2, 2014. The Rams won 13-10. (AP Photo/Ben Margot)