custom ruger gsr

I'm getting a stainless 18" Ruger Gunsite Scout. I plan on removing the rail conventionally mounting a scope (prostaff 2.5-10×40) via ruger rings. I'm still wanting back up sights. I don't want a forward mounted optic and I don't was an xs sight rail. I want to mount an express rear sight, or setting similar, on one of the sets of holes left behind from the rail. Anybody know the screw pattern? Distance from each hole? I can make a sight if need be, but if an aftermarket part will work I would go that route.
 
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