FLD120 grill screen

Mine is attached on the inside of hood/grill with cable ties. Was that way when I bought the truck.

 

I believe they fit right behind the grille and are held on with the grille screws. Thats how my ‘85 coe and ‘99 FL60 was.
The holes sometimes tear out after time from the constant push of wind and the screen will start to fall out.

 

Your grill holds it in place...

 

Original ones are riveted on the back side of the grill. You can take the 4 nuts off, remove grill. Drill out old aluminum rivets,(very easy to do). Use SS sheet metal screws with small washers, in place of the rivets. I replaced the screen, with screen from Home Depot, near the chicken wire. It’s about 1/4” square, twice the size of original screen. I doubled it up, offset,it to get a finer screening effect. Might want to buy 4 new bushing/ bolts for grill, before trying to remove it. The rubber bushing, that the bolts molded into, will probably break. You can climb up in there, and do it in place. Might be tough though. I’ve done both my Freightliners this way. $20, vs. dealers original screen for an outrageous price.

 

You would need these on the grill surround to hold that screen on the outside of the grill.
Hardware Kit For Bugscreen Or Winter Front Mounting Fits Peterbilt 359 - 4 State Trucks

 

You’ll have to drill 14 holes in the surround, for the turn buckles. Nice thing is it’s easily removed, and winter front ready.