Do you need to change the high and low beams separately when installing new lights on a 2004 chevy venture van?

I have an %26quot;04 chevy venture van and I want to change the headlights out but I need to know if it is a seperate install for high/low beams or is it an all in one install? I was also wondering if anybody could recommend a good headlight replacement? (it is a part number 9004)?Do you need to change the high and low beams separately when installing new lights on a 2004 chevy venture van?There should only be one bulb per side and it is removed from the rear of the headlamp housing by twisting of the retainer and then remove the bulb wire and all. Do not touch the surface on the new bulb only handle the by the metal base re-install connect the wiring and re- insert back into the housing.

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