Good day, dudes and dudettes, the movie in question, 'The Godfather Saga' is NOT available on vhs or any other format. 'The Godfather Saga' was an NBC dealy that aired in 1977, cut in chronological order with additional scenes and an alternate ending.
'The Godfather: The Complete Epic 1902 - 1959' is a 3 video box set released in 1981, which also had both 'Godfather' movies in chronological order. It also has almost an hour of unseen footage scattered throughout the movie.
'The Godfather: The Complete Epic 1902 - 1959' was upgraded to include 'The Godfather Pt. III', it was renamed 'The Godfather Trilogy' in 1992, again with a few more unseen footage. Both 'Epic' and 'Trilogy' are still available on vhs. Rumour has it 'Trilogy' may get the dvd treatment in the near future.
So, the 'Saga', which you keep referring to, was only edited for television, it is not available anywhere or in any format.