Either get new bases or find out the manufacturer of the mounts and see what kind of rings they sell. I just looked at another gun similiar to yours on line and the front scope ring had a ramp so that the ring angled back toward you. The front ring was actually above the bolt. The back ring was normal. They may have had similiar rings on your gun so that the scope was closer to the shooter. For these style rings it looked like the bases would have to be different heights.