Simpsons Wall Switch Plates
Replace your plain switch plates with these Simpsons originals! Fits a standard USA light switch. Size: 5.25″ high by 3.5″ wide. Comes carded.
Simpsons Collectables at the Garment District Online Store
Scroll halfway down the page to view the switch plates.
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Thanks for the information about the wall switch collectible plates though the link seems broken.