There are many narrations in Sunni and Shia books regarding the 73 sects, but most of the narrations have additions which are not authentic especially what is in some Sunni books that the saved sect will be those who follow me and my companions ما أنا عليه وأصحابي. Leading Sunni Ulama stated that this narration is fabricated.
Our Shia Ulama narrated many narrations about the 73 sects as find in Bisharat Al-Mustafa narrated from Ameerul Mo'mineen (AS) which states that saved sect will be those who follow the real successor of the Prophet (SAWA).
This narration does not mean that all Muslim sects will be in hellfire except one sect, but means that there will be right sect despite of the different sects. The followers of the right sect will be saved because there have obeyed the orders of Allah (SWT) and the Prophet (SAWA).