The front base hole spacing is about dead even with the Weaver base #46 which is what the chart says is right for a large ring 98 front. The #45 base is what it lists for the rear, but the hole spacing on it is closer to .481. There is a Weaver cross-reference chart that gives all base lengths ,thickness, hole spacing, and radius (underside), which is what it would take to see if there's a base that fits your specs. It may be available somewhere on line. I have paper copies at school but I won't be back there till Apr. 1st.
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