Align object with Planar SRF

Hi everyone!

I am trying to rotate these objects that are modelled in a rolled surface. In order to fabricate them I need to have them aligned in a planar surface. I have tried rotating and orientating but nothing has worked. Does anybody know how I could do this without changing the shape of each object?

How I want each object aligned in the plane

How they are orientated right now:

Thank you! (3.3 MB)