the grill opening is identical on all 5-7 TF trucks, so the big bolt grille will fit the light trucks, but you're left with a number of flat spots where the regular mounting holes are that would hafta be filled
and TUT, the 58/9 big truck grill is a bit "stretched" at the park light ends because the big truck fenders have a slightly wider opening due to the bigger "bubble" for the wider tires, the 5-7 fenders only have a different wheel cutout
Bill