Actually they will scratch the glass because dirt and grit blowing around in the air
will get in the crevice between the rubber and the glass and scratch the glass. I had to replace my original front window glass because of this in 1980. Since then I have had shorter
glass runs and my windows still look perfect. they really don't need to touch the glass if you don't drive the car in the rain, but of course what you use is up to you. I suspect that the Ames glass runs are purposely made shorter to avoid scratching the glass. As for the rear blow out clips, my original rear windows were ruined by 1973. I removed the blowout clips, replaced the windows in 1973 and they still look perfect today.
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