1990 astina gt (323f) speaker sizes

[tau9]

hi! My astina doesn't have speakers in the front doors. What's the max speaker size i can fit in the front doors of the 1990 astina gt?

It's a good idea to put tweeters on the dashboard?

At the sides of the dashboard, facing to the seat/floor there are 2 holes that looks to be for speakers. here's a pic i've taken from the internet. Look at the arrow, the "hole" I'm talking about is there, over the fuse box.



thank you!