Looking for an old Jane Fonda and Peter Finch movie!?

Ok I am looking for In the cool of the day from 1963. It was with Jane Fonda, Peter Finch and Angela Lansbury, I would love to find this film, because my mom was an extra in it when she was a little kid. We've been looking for this movie for ages and we just can't seem to find it. Does anyone have any suggestions on where to find this movie? Thank you!!!