According to the speed passion site, a 7.5 is the limit for a Reventon R
Here are a couple pics of my installs to hopefully give you an idea, the first with a Viper VTX10R and the second with a Tekin RSX. Both are installed with a Spektrum SR2000 receiver, the smallest of their receivers (that I know of) and has the added benefit of a built in antenna mount.
