What is the proper vehicle power adapter to use with the hp 2000-2a28dx notebook?

I would like to buy a vehicle power adapter for my HP 2000-2A28DX notebook, preferably by part number, voltage, and wattage.

I found 2
http://www.shopping.hp.com/en_US/home-office/-/products/Accessories/AC-Adapters/ER691AA?HP-90W-Noteb...
http://www.shopping.hp.com/en_US/home-office/-/products/Accessories/AC-Adapters/KS474AA?HP-90W-Smart...

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