in the umar hills quest once u get to the temple ruins where do u find all the parts to that sun thingy??? i got to parts so far and it says ya need 3 where are they all?? and do u have any advice for the shadow dragon cause this my fisrt time playin bg2 i ahve aparty with level 12 mage and aerie minsc cernd anoemen and nalia

Just use standard anti-Dragon tactics. Lower its magic resistance either by using the Priest spell, Magic Resistance, or the Mage spell, Lower Resistance. Once you have lowered its magic resistance, cast Insect Plague, Greater Malison and Doom to lower its saving throws and disrupt its spellcasting. Good attack spells include Feeblemind, Polymorph Other, Magic Missile, Flame Arrow, Melf's Acid Arrow, etc... ...

That settles the spellcasters.

For your tanks, prepare them beforehand and summon several summons to help you, like Aerial Servants, Fire Elementals and Mountain Bears. The summons should engage the Dragon's front, while your tanks hammer at the Dragon's back. This is to counter the Dragon's Wing Buffet. Cast beneficial spells on your tanks beforehand, like Resist Fear, Protection from Evil 10' Radius, Chaotic Commands, Chant, Defensive Harmony, Bless, Draw Upon Holy Might, Armour of Faith, etc... and potions as well.

Parts Spoilers
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1) Reward from completing the rituals with the talking statue.

2) Loot from a container in the room where a shadow tries to deceive you.

3) Reward from the spirit of a little girl when you return her bones to the ghosts of her followers.