You don't need bases with a sako rifle. It comes with built in dovetail mounts. You buy Sako rings that mount directly to the rifle. I believe that Millet makes Sako style rings also.
For what it's worth.... I work for both Sako and Leupold as a rep. I just set up an 85 Finlight myself. The Sako Opti-Lok rings to require a base, the Leupold set up is a true "ringmount". Both work well.
I ended up using the Opti-Lok on this gun, but I have a set of the Leupold ringmounts that I am not using. PM me if you are interested.