HI
I have 98V70R and it has a speaker on the dash. do any one know what size is it and how to replace it

 

You must buy the Volvo speaker, nothing else fits.
Pop off the cover, and remove the speaker

 

I beg to differ, I have a 98 V70 T5. In the top of the dash, as well as in the very back on the rear cargo posts were you change the rear lights, are some small tweeters. I replaced all of them with Boston Acoustic directionals. Took very minor modifications to fit them to the stock holding fixtures. In the doors I have Boston Acoustics and in the rear Alpines. Much better than OEM!