| Idk about that eBay link... Yea it says 12v transformer but you need to know if its a 12v input or 12 output. Doesn't say what it is or what it requires or outputs.... It's like saying I need a 3/8ths adapter... Well from what size TO 3/8ths? Or is it 3/8ths to a different size? Anyways, if you need 120vac in your car then you need an inverter similar to the following [ http://www.walmart.com/search/search-ng.do?ic=32_0&tab_value=all&search_query=12vdc+to+120vac+inverter&pref_store=1908&ss=false ] 
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