@UsmanAnsari If you need to change the plug wires, most probably you had the genuine ones. Now if you buy some SEIWA (this is the most popular brand) or Ultima plug wires, you won't enjoy as much, because they won't last that long.
If you go for genuine, they'll be very expensive (AFAIK Rs. 2700-7000). My advice: Just buy some American Silicon, Autolite or Splitfire racing grade 10mm wires. You'll see improved performance, better engine bay looks and the wires will also last longer, plus cost lesser (Rs. 2100-2500).
In future if you have to change ignition coil (this happens every 6th or 7th summer for nearly all cars run on CNG), you can just pop in some GT or racing coil and enjoy new avenues of pick & performance.