There were plenty of screw holes to weld when the Plexiglas went to the trash too. These sunroofs are hard to find. But let me clue you in on a secret. American Sunroof Company was the contractor for these B-Body sunroofs and they can be found in junkyards in C-Bodies and in Cadillacs. Yep, many big GM cars used this very same complete sunroof. I was lucky when a good friend found a near new condition complete sunroof assembly at the Spring Fling for $150.