Update: So I have finally managed to find the actual OEM Front Brake Pads for my Vitz KSP-130. Their Part # is 04465-74020. They are also OEM Front Brake Pads for Toyota iQ. They are the exact same ones which came factory installed from Japan.
These brake-pads were only available with Kamal Autos' Montgomery Road, LHR. The price they charged was Rs. 5,300 for the set, and I think it is quite reasonable considering that the same parts would have costed me in excess of Rs. 8,000 had I ordered them from eBay or Amazon.
While searching for them, I went to at least 7 to 8 OEM parts retailers in the vicinity and everyone was giving me the same pads which were available with Toyota Ravi and other 3S dealers. However, the prices they were charging was in the range of Rs. 3600 to Rs. 4,200. In comparison, Toyota Ravi and other 3S dealers are selling them for Rs. 10,000, despite the fact that they are not really meant for this model of Vitz. They can be used, but in the long run they will severely damage the brake rotors.