Who and where should i buy a new top for a 69 barracuda

Top Dust Boot snaps on over the top when the top is down from outside the car on the snaps that are visible when the top is up.
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The Well Liner remains snapped in place when the top is in the down OR up position
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The water drainage is handled by the metal rail around the the lip where the well liner snaps are located as I recall.

other warnings

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Hope this helps