I'd remove old chair and see where the old fasteners match up with the new chair base. A piece of flat bar stock, 2" wide could then be fabricated into new anchoring for the chair. I'd cut a bar long enough to wrap around the round base and flatten out. Drilling a hole through the folded bar for the bolts should do a good job of anchoring the new chair. I'd want at least 2, more likely 3 anchors bolted down to hold the new chair in place securely.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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