@xtreme1racer,
Bro, plugs selection is right but price is too high, you pay each plug @ Rs.250, here price of these near Rs.200 each, its better to buy platinum or bosch super 4 in that price range, a shop named "OPTIMUM" in D.H.A zamzma karachi ph:5868451 call Mr Mohsin, they have good variety of spark plugs like Autolite platinum, Bosch e.t.c.
@khawaja4000,
For Sentro install Bosch FR78X or in lower price Denso K16RU-11 are best.
@Imrandahar,
Fr78X or FR78 boths almost same now FR78X are come, gap is preset from factory for CNG & petrol, no need to change any gap setting if you change then plug may damage or malfunction.