How to find spare part number

[JMD100]

First time in any forum. Fingers crossed. The top cover on my Officejet 200 mobile printer CZ993A has snapped off. The paper rests on this as it feeds in.  I’ve looked on hp part surfer but there is no part called “top cover” though this is what it is called in the manual. I see ASSY-PEN ACCESS DOOR and ASSY-SFP TOP CASE, PAINTED and ASSY-INPUT TRAY SFP. Does anyone know which part I need? Thanks.

[Valsimot]

On those consumer printers it's hard to know but I would go for CZ993-60005 assy input tray

[JMD100]

Thank you for your help. I’ll give it a try.