*www.amazon.in/dp/B00NUUHZPU/ref=psdc_1388973031_t1_B01N3T7ZMO
OR
Just buy psu cable from any local pc shop,those 10A cable will also work fine as a 550w psu will never draw 10A current even at 100% load.Even 6A cable will work fine but 10A cable should have better build quality than 6A cable.
@SaiyanGoku my CX550 also came with 13A cable but currently I am using the usual 6A cable due to some other reason. CX550 has ~80% efficiency so even at full 550W load it will not draw more than ~690W & at 220V the max current drawn from wall socket/ups as per P=VI should be 3.14A.