The corner windows are tempered glass and can not be cut with a glass cutter. They will have to be sanded down on a belt sander. I've never tried it but I have seen the finished product in trucks.

"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.