Creating rectangle over a buffer circle with specified angles/rotation?

Hello everyone,

I have a layer that is a circle buffer around a point. What I want to do is create a rectangle around the circle, but have every rectangle be perfectly lined up N/S (0degrees of angle/rotation). I have tried using Minimum Bounding Geometry, but the rectangles are all rotated a little different each time instead of all being the same. Is there any way to do this?

Thank you for the help.