Don't waste your money on irridium plugs, those are not meant to be used in this engine. Only advantage that this engine can benefit from irridium plugs is the time factor of around 100k kms.
D15 dual VTEC engine requires ZFR6J-11 (NGK) spark plugs.
However, you will get ZFR6K-11 from the market and not the J type. You may also use BKR6E-11, otherwise. Former ones will cost you 300 PKR/ piece and the later ones will cost you 250 PKR/piece without HONDA branding in original NGK packing.