Its a pity that this forum is kinda dead and those bros with good technical knowledge of Latio has left.
Till date no one has enlighten me on where to buy the parts.... but nonetheless, with googling around I managed to find out the parts numbers hence decided to share here for the benefit of the next bro who might need this info.

it is true that this forum is not as active as before.....for those still around, perhaps the owners no more DIY or going round to buy the parts and then look for w/s to replace and install....dun feel offended or disheartened....
now we have our Dr Latio (aka Kelvin @ ERA Workshop) who has good knowledge of Latio & charge reasonable (but maybe not cheapest) price at AMK Autopoint...