Try using #4 flat head 1/4inch sheet metal screws after drilling proper size hole. The head will bury itself in the fabric and not interfere with the glass.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix