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This is a bracket for Gideon's Ultimate64 main board when installed in a 64c case.
When the board is installed in a 64c case, the entire back edge of the board is unsupported. Granted, you're not normally pressing down on the board to flex it, but some support is needed here if you plan on installing SIDs or changing jumpers with the board installed. So, I designed a board support for much of the back edge of the installed board. The support surface is just over 8" long. The board is now much more stable.
Get one of these for your Ultimate64 machine. We also offer specifically designed keyboard support brackets, and a power plate cover for the Ultimate64.