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Doyle, that I know of...this issue has not been covered before on the forum though someone may have done so and might respond.
A call to Catalina may be necessary to get the answer. I think however from some general observations that I made when viewing some of the pics of those with the stern seats... that the quarter stanchion locations on the earlier boats doesn't correlate to those for the stern seats which would mean some degree of effort to patch holes. That being said, I suspect they could be added... Catalina can verify.
If you discuss it with them...let us know the answer, its an interesting question.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.