You can contact Dubai Autos in islamabad/rawalpindi, Optimum Motorsport in Karachi, they will most likely ship the kit to you. Otherwise go to any renowned store that shelves Meguiar's or 3M in Lahore and they'll have it. Buy the whole kit.
It's very important and if you neglect this part, you'll be needing new headlight lenses sooner or later and they don't come separate so you'll end up buying a pair of headlights.
Without any protection, the lenses won't really have much scratches but they'll start to get yellow as time passes by which is worse.