Just got my Accord!

Hey, I just bought my first car... a 1990 Accord LX... It's white and is in very good condition and I learned to drive standard just for her.

Well, now I'm going to throw in some speakers and was wondering if anyone knew the exact size... I'm pretty sure the back 2 are 6"x9", but the ones in the door, I'm not too sure of.

I'm sure that they're either 5"1/4, or 6"1/2...

Any help would be appreciated! Thanks.