Follow this drawing for the Trutrak bracket install in a 7.
Please remember that the dimensions apply to a Trutrak provided bracket, not necessarily others like Dynon or GRT even though they "copied" the Trutrak format.
Note this drawing does not show the hardware (IE. safety washers) and bolt spacers required for a safe installation. Please look at their site or contact Trutrac for the complete package of instructions.