RX8 will fit on either side with inline saddle packs.
If running on the left side, you just need to trim the back section of the FT saddle pack mount.
If running on the right side under the belt tunnel, you need to trim the back right side of the FT saddle pack mount AND cut the fan mount off the RX8.
I run mine under the belt tunnel on the right side.
I don't need to run a fan on mine as it only gets up to about 124F on hot days.

If installing under the tunnel, you need to remove the rear spur cover along with belt covers to mount.