This is the old style cambo sliding back with interface adapters that needs screws.
All cambo sliding backs are very well made, graet quality such Linhof, Arca, Silvestri.
One problem is that the all the interface adapters have not the same focusing plane, so you need to use the metal shim.
The Linhof/arca/silvestri adapters have the same focusing plane, but Cambo like Kapture group dont have ( at cambo you have to shim the adapter plate, at Kapture Group the focusing glass)
Just call or write to Cambo and you will get the shim part. You have to know what interface you want to use.
Second: best option is to let the Cambo to mount the interface adapter, becouse the screws must be absolutly flat in all 4 positions.
Differences of 1/100 of milimeter can make big problems- one side is not sharp ect...
You can use only the older adapters with screws on this sliding back, not the new.