I replaced the old Danby air conditioner with a new one. I removed the receptacle to pull the old cord and run the new one behind the wall, and the clips that hold the receptacle in place fell behind the wall. I am not going to try and fish them out, what do the clips that attach to the receptacle screws look like so I can purchase replacements.
@RayjoeJim, those clips are little pieces of plastic that rotate clockwise when you turn/tighten the screw. These "ears" which rotate trap the receptacle box in place with your plywood bulkhead/wall (or sheetrock in a house.) You can probably find replacement boxes at any HomeDepot/Lowes/bigbox store with the name of something like "cut in box", typically the plastic is a bright blue color.
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Here's a screen shot from Lowes... less than $2.50 for the whole box.
Subaru Crosstrek 2016