Mahir,
The US Spars (z-spar) mast are normally configured with the inner stay attachment being near the mast head...usually about 50cm below the forestay..but depends on the boat. You can check with US spars on this.
In this way you do not need runners.
But it makes it an impractical cutter rig, as the inner forestay is only a meter or so aft of the forestay and at the top quite close. So trying to tack a genoa through this would be a bear. That's why most folks go to the removable innerstay, bringing out when needed and not putting furling on it.
I'll have to dig around to see if we have any pictures.
bob