Laptop Car Adaptor

How do I find what is the correct Laptop Car Adaptor for my lap top (HP G60)

I have done a quick search and found a few that could be useful but when you look at the pictures they don't look the type of adpter that could fit into the fag lighter socket in your car.
This one below from this site





Or from the HP Site


Either way it would be best to phone to make sure proir to ordering