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You can't, and you probably don't need to.

The ROS LaserScan message represents a scan in polar coordinates - as an angle and an offset from a center point. Since your laser scanners don't have the same center point, it doesn't make sense to put data from both lasers into the same message.

If you describe your robot and your application in more detail, we can probably help you find a better way to do what you're trying to do. (For example, the navigation stack supports multiple lasers).