Two in the middle to the crossmember, Colin. If you want to see a photo go to my site at the bottom of the page. Go to photos, about the 3rd or 4th page of the photos. Two bolts on both sides to the inner fenders and 2 bolts on the top to the inner fenders.

https://sites.google.com/site/bluejaygarage/home
53 half ton http://s159.photobucket.com/user/sworden73/library/?sort=3&start=all&page=1
72 Nova SS sold
75 Corvette
52 Chevy Styleline Coupe