Upgraded the scope on my Sako 75 and bought Stainless Optilocks so these are now spare.
Sako extra low mounts fit upto 59 mm external diameter objective according to Sako's data http://www.sako.fi/pdf/specs/Optilockring.pdf
Fits 1" or 26mm tube.
In good condition as pictured. Not perfect as have been used but these are amazingly engineered and indestructible.
My new bases were £53.99 and the rings were £89.99 from Sportsman. I will sell the blue ones for £100 posted.