iQuartz White Pure (need to top up a bit, i think about $50 more pfr for vendor pricing)
Can't rem the brand of the W/C. But you can find at Jalan Besar that stretch. About $260 for one and $280 for the other. It will be good if you are able to measure the distance between the wall to the center of the w/c piping. For bto, usually need to buy the "s-neck". I didn't add $50 to $80 more for the gerbil flush upgrade.
So far, the flushing still Ok for me.