If the holes mentioned are way down near the bottome of the fabric below each corner of the back window and look alike, they are factory made. Their purpose is for the water to run inside to the natural runway and over to the drain tubes that take it out of the car. If the car sits out all the time, after a few years the top will shrink and distort the holes enough to cause the water to not run to the right places. Or the drain tubes are plugged.
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