In Dash Speaker Upgrade?

[Golden 68]

I would like to add a kick tail speaker, or at least whatever is better than the original. Any thoughts?

 

[Golden 68]

Is that a 4 x 10?

 

[horse sence]

I have my dash pad out ,the bolt pattern is 4 3/8 x 4 3/8 inches
the speaker measures 5 x 7
when you pull the pad leave the plastic piece above the glove box attached to the dash pad but the gauge cluster stays attached to the metal lower part of the dash

 

[horse sence]

 

[Golden 68]

Thanks HS!!!