I can't tell you about fit because I bought this for a custom build kit and obviously had to cut the hole for it myself but what I can tell you is that it's good and strong and has a perfect edge to it. Even the countersunk holes have a perfect finish. Good and shiny and looks awesome on my build.
Good quality product. Not quite as nice as the original Gibson covers but robust and looks the part mostly. The only thing I noticed was that they weren't exactly fitted for my Les Paul. There was a tiny bit of a difference in size. Not enough so that it didn't fit but definitely noticeable tiny gaps on the perimeter of the coverr on closer inspection.
If I were to replace the back plate on an expensive instrument I would probably invest more in the original Gibson cover however with a cheaper instrument this definitely does the job and ultimately there is not a huge difference anyway.