I need a Ktown2 board for an Onyx2 G-brick.
You might want to double check that - Ktown2 is the interface board found in the O3x00 series G-bricks and is part number 030-1593-001, not Onyx2 G-brick (Graphics Module) which is the standard Ktown board part number 030-1067-001.
I appreciate they are similar in a lot of ways (I have both here!) but it all depends on what host your wanting to plug into your G-brick...
I do have spares here though of either, so if you PM me with what you need I'll check in the morning and come back to you.