The RSA000 is the top assembly only. For the interface bracket that attaches to your projector see SLBU (universal) or use Chief's MountFinder to determine which model number matches your specific projector.
Features
Compact design is smaller than the RPA by 1/3 and includes the same great features
Independent roll, pitch and yaw for quick and precise projector registration
Quick connect/disconnect with convenient lamp and filter access on most projectors
Disconnecting maintains registration and doesn't affect preset adjustments
All-Points Security steel-into-steel locking hardware at all connection points protects against theft
Multiple installation options including: flush mount to ceiling, use 0.25" threaded rods, or use a 1.5" NPT column