Thank you.
As you can see, there is a discrepancy with the age/year of birth you have given. This is a regular occurrence with records but does not help in trying to go back to Roscommon records.
Irish registrations began in 1864, so you would be looking at Parish records for Bridget’s baptism.
You would need the Catholic or Civil Parish. I am assuming that the family were Catholic.
If you get the 1865 marriage certificate I posted earlier, it would give you the fathers’ names and the witnesses might help in identifying them also.
I see that there is another McManus in the censuses with your family. If I recall, he is a nephew so there might be McManus family records available.
I have tried for other Toolans local to your family but no success yet.