Well, without drilling, you can use a C clamp in the center of the gap. I used to use a 1and a 1/4 inch C clamp to seal the top bow to the windshield frame. us a bit of rubber or leather if your chrome is nice. I think it was 1 1/4" Measure first. :) Eric 46 MGTC 59 MGA 65 MGB 70 MGB 71 MGB so many cars, so little parking