What other lenovo devices have the same casing as the Lenovo 80XR?

Hi @lenovo61058

Here's an image taken from p.86 of the hardware maintenance manual for the laptop, showing the part numbers for the various lower cases for the laptop.

Search online using the part number only, applicable to the colour of your laptop, to find suppliers that suit you best.

Usually the part number is to be found somewhere on the inside of the case, (once it is removed) if you wish to verify that you're getting the same one. Go to p.36 in the manual to view the procedure to remove the lower case (aka base cover). Not sure and it's not mentioned in the manual but once the screws have been removed from the cover it may not come off because it is being held in by clips as well. If it is then you may have to run a pry tool around the seam to release the clips (a guitar pick works if you have one of them)