may i suggest that you contact the broadcaster who aired football games featuring the 49ers in 1975 & tell them exactly what you are looking for.
NFL Monday Night Football - 1970 Chicago Bears at San Francisco 49ers 43-12 was released on: USA: 19 November 2012
NFL Monday Night Football - 1970 San Francisco 49ers at Arizona Cardinals 43-9 was released on: USA: 29 October 2012
NFL Monday Night Football - 1970 Pittsburgh Steelers at San Francisco 49ers 42-16 was released on: USA: 19 December 2011
NFL Monday Night Football - 1970 Pittsburgh Steelers vs. San Francisco 49ers - 9.13 was released on: USA: 27 November 1978
NFL Monday Night Football - 1970 San Francisco 49ers vs. Chicago Bears - 19.8 was released on: USA: 24 October 1988
NFL Monday Night Football - 1970 Philadelphia Eagles vs- San Francisco 49ers 24-18 was released on: USA: 3 January 1994
NFL Monday Night Football - 1970 San Francisco 49ers vs- Arizona Cardinals 39-11 was released on: USA: 10 November 2008
NFL Monday Night Football - 1970 Philadelphia Eagles vs- San Francisco 49ers 33-12 was released on: USA: 25 November 2002
NFL Monday Night Football - 1970 Detroit Lions vs- San Francisco 49ers 29-15 was released on: USA: 14 December 1998
NFL Monday Night Football - 1970 Arizona Cardinals vs- San Francisco 49ers 38-2 was released on: USA: 10 September 2007
NFL Monday Night Football - 1970 San Francisco 49ers vs- Seattle Seahawks 38-11 was released on: USA: 12 November 2007
NFL Monday Night Football - 1970 San Francisco 49ers vs- Carolina Panthers 28-5 was released on: USA: 29 September 1997