XLE 8 inch to 12.3 inch infotainment swap?

This is one part you don’t want to buy new because it costs more than the car. Get it from eBay or a junkyard.

 

The mechanical fit is probably OK. Perhaps you might need some trim. However, the firmware will probably conflict with the firmware of the multimedia computer, as it has a different screen resolution and aspect ratio unless the system can automatically adjust for the screen resolution and aspect ratio as in a plug-and-play device. There might also be a way to change the settings by using a communication tool though.