Wow, is this a serious post?
If so, PLEASE read available research on the Internet and in many, many publications regarding roll bars. They are VERY MUCH NOT THE SAME! If you are looking for the shiny chrome hoops that go behind the seats because they look cool, then that's fine. Pick something pretty.
Otherwise, there are many options for roll bars/cages depending on what you want it for. Many will actually provide you with no protection in the event you flip the car over. (Which I'd love to say you'd never do, but I've had a few close calls...)
Not to come down hard on you, but if you are looking for a roll bar for safety - the choice, and further, the INSTALLATION - are very, very important matters that are sometimes pretty complex.
I'll help you out, if you want. Just let me know.
(Also, for speakers, if you're looking for the speakers from the doors, just stop in at local junkyards. You should be able to round some up.)