Any advice on how to fix this? (pic attached) The plastic window is detaching from the cloth on both sides. I suppose that's the drawback of having the top tucked away for months at a time. It's a year 2000.

Is there a way to fix it? Or is there a replacement glass window (instead of plastic) that will work with a 2000?

 

You might try carefully gluing it (nothing to lose by trying) -
I'd contact one of the parts guys at Sunset Porsche in Oregon or Suncoast Porsche in Florida.

 

The glue will not hold. I have a cab too and had the same thing happen. It will either have to be removed and sewn/ double-stitched in or replaced per the person who handles all of the tops for BH Porsche. You can try the glue as a temp fix since it's not in a stress area like all along the bottom. The factory uses heat to seal the orig windows in. The 2002+ glass will not fit. Different size window and different frame.

TDK