Plastic chrome windscreen filler strip. When inserted into the windscreen seal, these push out the center of the seal and retain the glass. Often, over the years the sun turns these fillet strips brown and causes them to crack. The only fix is to replace them. One strip will fit either a front or rear windscreen, just remember to order a WC-JPC2017 finisher clip for each.
 
Make sure to see TOOL02 to make installation easier.