I ran driftmaster just like your pic for years. Never did like the mounting bases. Like the other poster said, the spyderlok bases are much better. Lower profile and more solid. I can remove my holders and fish from the front without tripping over the bases.
Also much easier to take off/on. No tools required.
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I misspoke when I originally posted. I was thinking of the mounting studs for the uprights. It would be 4 holes for each base. My bad.
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