1971 - 1972 GMC C15/C1500 Suburban Windshield Weatherstrip Seal With Trim Groove For Steel Trim. This windshield seal goes first on the glass and is installed using the rope-in method. The trim groove requires you to re-use your 3/8 shallow set chrome trim. Made from ozone resistant EPDM rubber and from the same OE specs as the original for an authentic fit and finish.