The front speakers will be 6 1/2`` and the rear are 6x8 for hatchbacks.6x9s can be added with some custom aluminum strip brakets and grinding out the hole a little.
In the doors its 6 1/2" The dash is 3 1/2" The back is 5" x 7" I just replaced all of my speakers in my 1989 convertible and it sounds amazing!
6x8
what size speakers fit in a 1989 Toyota cressida
6.5"
The standard size for Rear speakers and Door speakers is 6X8 or better known as 5X7
4 inch speakers. mayrequire modified fit. use www.crutchfield.com.
You are going to need 5 1/4 (5.25") for the front doors and the tailgate. These jeeps only have the 4 speakers.
The front and rear speakers according to the Metra Electronics Fit Guide are 6x8".
15 gallon
20 gallon
i believe they are 6x81/2 or 6x8.5
According to my Chilton's Auto Repair Manual : A 1989 Ford Mustang has a ( 15.4 U.S. gallon gas tank )