ONE MORE QUESTION 1970 CHALLENGER WHAT SIZE BUTYL RIBBON TAPE SHOULD BE USED TO SET IN THE REAR WINDOW & WINDSHIELD AND COULD SOME ONE TELL ME THE THICKNESS OF WINDSHIELD, I JUST BROUGHT A NEW ONE WANT TO MAKE USE. THANK YOU MOPARTS

5/16 butyl tape is correct. The original windshields were 6 mm. Most new ones are 4 mm. However the last Dart windshield I bought was 6 mm,so just check yours. I suppose with the 4 mm glass you could use the 3/8 butyl tape.