The windshield opening has a large tolerance due to being made of several pieces, each having their own tolerances. The glass has a tolerance also. So if you get a opening on the small end of the tol and a glass on the large end of tolerance, It'a bad day or two. Instructions say put top in them bottom. Tried mine three times before putting bottom then top. My glass guy said too nuch Chinese glass. If he breaks it, I buy a new one, not him. So I did it myself. Biggest tip, soap soap soap and suction cup glass holder, Use Pilkington glass and Steele rubber.I'm talking TF.