Not sure I follow, but there is a short base, a long base, an extended base, a quick release base, and then the straight up mount. There are five ring heights, with the Ringmounts being the fifth. The front mount will clamp anywhere upon the front bridge dovetail, and the rear mount rests on the rear bridge at the limiter pin. But, if you are not addressing iron sights, and have no need for the limiter pin, it can be removed, and you can then clamp the rear mount any place you desire on that dovetail.
Not sure many actually fit mounts anymore, as it sounds, here, that most just put the parts together like plumbing. But, if you hand fit the parts, and make corrections for scope adjustment, the Optilocks are easily shimmed at the ring insert and/or ring-base union, or the clamp can be machined. The mounts can then be removed and replaced without losing that fit.
If this is not enough for you, then a rail could be installed. The above Optilocks are also available with a rail base. You are not limited to the position of fixed holes in a receiver.
Also, not sure who first used the concept of a delrin "ball bearing" ring insert, Burris, Sako, or someone else...but the pivoting, self centering insert is genius.
There is only one position on the tapered dovetail where a pair of Sako Optilock rings will be both, mounted directly over the bore and parallel to the bore. The distance between the rings is not variable.
Increasing or decreasing that distance requires the use of 2 piece Optilocks with either the "short", "long", or "extended" base. While Sako specifies which action size to match each of these bases with, mismatching them with action sizes outside Sako specifications can theoretically add two alternative ring spacing options for any particular action size. While this is possible, it was not Sako's intention and still results in an overly complex proprietary optic mounting system. Further, despite all the pieces you've listed, optic fitment remains quite limited by modern standards.
The split Delrin heim bushing is a design element, which has proven to be best suited to fooling folks into mounting rifle optics off bore axis on Sako rifles without mangling scope tubes.
Your suggesting the use of shims only further supports my initial supposition that "Scope mounting options are extremely limited for the Sako and that Sako's tapered dovetail mounting scheme is a PIA".
I stand by my earnest assessment and suggest you revisit your understanding of Sako's proprietary optics mounting system, particularly in its most contemporary iteration.
