This is a generic mounting bracket for the DVL-A50 designed to lift the DVL ~5cm so that the actual minimum distance of the A50 is no longer 5cm but 0cm.
The bracket is confirmed to fit well on a BlueROV2 and will also be a great fit on many other ROV designs.
The bracket is mounted to the A50 using four M4 screws (included). Mounting the bracket on the ROV is done by using the two predrilled 4mm holes (screws not included).
This combination does not exist.