I just put mine in and they were 5 1/4.
The dash speakers on the left and right are 3 1/2" round speakers. I have no idea how big the center channel dash speaker is.
6.5 in the doors and 4x6 in the dash.
go to www.crutchfield.com and you can get info on any car as far as speakers and decks what will fit and what wont.
The largest speaker that will fit in the dash is a 4"x6". Not sure what the exact dimensions are on the OEM speaker. front speakers are 4x6 and the rear or 6x9
the fronts are 4x6 and the rears are 6x5
4x6" speakers in the dash. 6 1/2" round speakers in the doors and 3x10" or 3x12" in rear panels if ext cab
what size speakers fit in a 1989 Toyota cressida
all tops from 1978 cj7 to 1995 yj fit
The speakers in a 2001 Toyota Echo measure 4 inches in the dash, 6 1/2 inches in the front door, and 6 inches by 9 inches in the rear deck. The car may not have dash speakers, as they weren't a mandatory option.
4" in the dash and 5.25" in the rear panels, rumor has it that you can fit up to a 6.5" in those rear panels or a 6x9" with some trimming.
5x7 speakers
The front speakers are 6-3/4 and the back ones are 6x9. As of right now I haven't found a direct fit for the tweeters without having to modify the dash.