How to order baptismal certificates for great grandmother (from Killmury, 1 March 1853)

Hello,

I need to order authenticated baptismal certificates for one great grandmother from Killmury (Cork/Ross/Ovens) parish (30 Novembr 1837) and another from Ovens/Aglis (1 March 1853).  I have the microfilm numbers.

I can't find where to order them to be mailed, but I will be in Ireland late July.  If it is possible, I could go to the churches and ask, but I don't know where they are.

Does anyone know how to do this process?

I appreciate any information.

Thank you.

Eileen Whelan Ariza