There are some universal rack ear kits out there (basically it has a bunch of flush mount screw hole drilled into the side in a grid pattern). As long as you don’t absolutely need to have the switch be perfectly aligned in the rack (I.e. it might stick up above or down below the 1u rack unit it is in) many of these would work. You can also look at a rack tray which seem to be cheaper to find than the ears for these switches, and then just use some Velcro or double sided tape on the bottom of the switch to keep it from sliding without some decent forces applied to it.
Also, for anyone who was having fans not spinning down (at least on the 6610), I found that if you have 2 power supplies installed and only one connected, it will not slow down the fans from the highest speed setting. Not sure if that applies to several of the people posting about their fans always being on full or not, but thought I would share (I mentioned it before, but it is somewhere buried in this thread).