Redfield receiver sights

[heviarti]

One, are all of these set up with 5/8 centers for mounting? Two, is the sight pictured here built to be reversible?
http://www.gunbroker.com/Auction/ViewItem.aspx?Item=195723887

Someone in the history of my type 99 arisaka made two screw holes on the right rear of the receiver at 5/8" centers for a commercial receiver sight. I'm assuming that since the front sight is a redfield, the rear (now missing) was also probably a redfield.

 

[Jonny V]

You probably need a sight for a Mauser or Springfield, their mount holes are on the right.

 

[chas08]

Or perhaps a Williams. Thats about the mounting hole span on the set I have on a Ted Williams 100 (Win. 94) It appears that it could be mounted on either side of the reciever by just turning the aperture bridge around.