Hope just contacted me, telling me matchmaker mounts are only available in silver. And that there is no advantage in having them anyway, as they do NOT improve the relative positions of brake and shifter levers...
...I have done mine now without mounts (as Hope suggested to do so) and they look and feel great. I notice that by sandwiching in the shifters this way, the levers and shifters have pivot points perfectly on top of each other.