With that tray removed (memory is fading) are there nut plates where the screws would go into, are they exposed and easily removed? If so, take the tray and the nut plates to a REAL hardware store, the one with the unlimited mountain of those pull out drawers full of hardware and a guy that should of retired 165 years ago.
They should be T-20 Torx Screws if you're talking about the upper cubbie that has the 12volt plug in it.
Go to the 4:05 mark of this video