Hey there! Those backstops are hard to come by. I used to own one but sold it about 8 or so months ago. It wasn't what i expected it to be. I actually wound up getting a pair of goldo back boxes (rockinger also makes one just like it) and used those instead. They felt way better. In the end though, i still wound up removing them. Just used 3 or 4 springs to help with the double stop bends.
There are 2 different versions however. The original was made from a casting process. And has the ibanez brand logo on it. The 30th jem anniversary versions were made from cnc block and do notnhave the ibanez branded logo. I'll try to find skme pictures.