Adding a Fan Shroud

Is your radiator from Engineered Cooling products? If so it will have radiator shroud mounting side flanges. You can make mounting tabs on your shroud out of the aluminum you cut out of the center of the shroud kit for your fan hole.

Fab em up, and pop rivet them in place, use body clip nuts on the flanges and regular SEMs body bolts. I have found with pop riveting brackets if you scuff the metal good at the bond joint, and use a bit of jb weld between the pieces then wet install everything the brackets shouldn't rattle loose over time from vibration. Use enough rivets and spacing when you make up the tabs. It's better to make the tabs bigger and have more surface area for the rivets and for the pieces to mate together. I'd make the tabs with 5 rivets each with staggered spacing.

I used 14-20 steel riv nuts or nut serts in the radiator flanges on mine, and used sems body bolts w the captured washers.

Hope this helps
Matt