Model Year Listing

Hi I'm new to the Mazda 6 but I am seriously considering it for my next car. However as a broke college student, I most likely have to get a used one. I am interested in the 5door version but I am willing to look as back as 2003. How do I find out which years even offer the hatch version? Is there a list somewhere where I can find the trim and features depending on model year? I was hoping the wiki here would work but it appears to be down

Also, as it would be my first time buying, I was wondering when dealers resell used cars, are you able to customize the features like you would on a new car?

Thanks!