spacebargrey i think means the same color as whiterice's double shot set. It was a dolche black color setting. The spacebar was a dark grey.
The filco/ducky bit just means it is compatible (the spacebar fits).
If you want a spacebar same like your Ducky get black color. If your getting 7bits entire kit then your gonna need the grey instead to match the color of his double shot set.
Ducky's pbt spacebar i found was pretty good.