Replacing Speakers/Subs

I have a 1987 Toyota Supra [Non-Turbo], I am wondering what sizes of speakers would I need to change the speakers on the side doors? Also I believe that I have a sub on the side of the liftback, but I'm not so sure since I just bought the car last friday. Can anyone help me out? Thanks!

The stock sizes are 4" in the doors and the hatch, anything larger than that and you'll have to custom fabricate it. I believe in 90 or 91 they came with larger speakers in the doors (also a much larger grill to cover them) so if you can find those brackets they will be bolt in. As for the sub you should know if it has one or not, 87's didn't come with any subwoofers so if there are any they definetly aren't stock.

ohh.. alright thanks!

oh btw.. will replacing speakers be a hard job? what tools would i need? im a high school student and off break so i would have time to intall it.