Dell E514dw duplex tray part number - Brother compatibility

I've just got a used e514dw but its duplex tray was missing. Browsing around, it seems that this model is mechanically the same as some Brother printers, and there are much more stuff available for them. I'm trying to figure out the compatible Brother part number. If you have an E514DW, can you check what the model number is (mold into the duplex tray) ? I expect something like LY NNNNN.

Dell support said that the dell part no. was RKY5H, something that does not give too many search hits, but it suggests that the E310 also has the same duplex tray.