I happened to be at Home Depot for something else, so I didn't get a good look at our exterior floodlights that need to be replaced (they're about 13 years old and don't work anymore). So I picked up two of these, just to have 'em in case they were a good fit:
But when I came home I saw that the boxes on my house are rectangular and not round like the lights I bought. I was planning to just exchange them for the right kind, but then I noticed that in the description on that Amazon listing, it says they work for round OR rectangular waterproof housings! So... what gives? Can I actually expect to mount the round lights on the rectangular hole and have 'em work? Seems too good to be true.