I contacted the company that makes them, they dont build one to fit the BX23S. Looks like its the way the BX23s ROP`s is built, its a different ROP`s on the BX23S. The BX23S ROP`s is all by itself, no other tractor model in its size uses that particular ROP`s. Location of the fold down area seems to be the issue, fastener locations, which is where the cab is mounted to ROP`s(?). I always seem to pick/buy the equipment that you cant ever get anything for...story of my life it seems...lol.
Here is a breakdown and instructions for the cab
http://www.originalcab.com/assets/images/12078manual.pdf
Heres a video of the installation... i can see why it wont fit the BX23S`s now.