as mentioned above this is the factory install - the usual failure point is the coil tower connector going to the 2nd and 4th plug, it breaks off if the mechanic levers it too much during uninstall.
These coils are also used in mitsi lancer and galants. The side ones are also from mitsi lancers and galants too, hyundai had a lot of engines with them too including the santro, same wiring, no difference at all in working.