I'm very new to Solidworks so this might be a simple problem on my part. What I want to do is mirror the tab shown below about the 'Right Plane' so I have an identical tab on the opposite side of the part. However see the screenshots below. Clearly this is not a mirror of the original tab. It looks like it is extruding the new tab to the same face the original was extruded to?
How do I mirror just the tab? Attached is the file.