It'd be nice to have the strip I suppose, but mine didn't come with it. I've got about 33,000 miles on and it's just over a year old. My windows are in fine shape. You can see a gentle little indentation on the inside where window flaps against the bar, but there are no scratches. It's nothing major and it's hidden by the bars anyway. You also can't see it from the outside. If you can get the strip, that'd be good; but, if you don't you'll be ok, too.
2004 Wrangler Unlimited, Shale Green, soft-top, Shrockwork Rocker Guards, Kumho 31x10.5 AT's
Green Jeep Club Member #119