I have installed windshields in two '59s and my '56 from 3 different local suppliers. The first '59 was about 15 years ago and the glass fit nicely. The other two the glass did not fit the opening well and it took some finesse to get it where the gaps were equal and some sealant to close it up.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.