i would like to replace the speakers in my 1999 f150. i do not kno what sizes are in it. they look like 5/7 " in the back, but the front i am not sure if they are 51/4 " or 61/2". could someone please clarify thisa for me.

 

Go to the Crutchfield web site to start. Enter your truck info and it will tell you the speakers that fit. Even if you buy the speakers elsewhere Crutchfield is a good place to start.