No difference between the 75 and 85 dovetails. Like dogmatix says, the one piece ringmounts are the best option in most cases. They are the lowest of the Optilock mounts in 1" and 30mm. The two piece Optilock ring and base mounts are higher than the ring mounts even in their LOW configuration and are a darn sight heavier and more expensive than the one piece ringmounts.
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