Okay I'm always up for a challenge...
the ones your after I think are
Model Name: RayBan RB 3154 Olympian Square Nylor
In the final scene Will is wearin oakley Pro M frame
other sunglasses in the movie..
Will Smith
Nylor Gunmetal CR39 Grey/Green
Ray Ban 3176 017/3F Predator Flight Pande Light Blue Gradient Light Blue
Persol 2094S 594/48
Martin Lawrence
Persol 2653S 24/13