If you have a altis 1.6, you will be needing speakers for the front doors and rear speaker parcel shelf (behind rear seat headrests).
On the 1.6, they didn't come with tweeter pods on sail panals from factory. So if have them, you can easily get a 2 way component speaker in the front. For the rears, you can either get 6x9 speakers (you'll still need to make a adaptor for it or get one) or 6.5" coaxials (and still make a adaptor for it)
I have an extra pair of sail panels if you want them. Also depending on whether you want to go for the 6.5" or 6x9" in the rear, the adaptor rings can be sent with the speakers too