Where would i get the metal pieces that connect the car to the battery? The positive one has been eaten up by the battery acid pretty bad and i shoulda changed it when i got the car.

The battery cables? You can buy a generic one at the local parts store, or if you want car specific, you can get one at the stealership, junkyard, or ,(I think) mazdatrix sells one.

If you are talking about the hold down clamp, junkyard, or pm me a pic. I might have one laying around.