I just bought a 2006 Civic LX, I can not find speaker sizes anywhere! There is nothing on the website, nothing in any of the paperwork/owners manuals and nothing on Honda's OwnerLink website. What is the proper way to measure the speakers? I can do that and let you know, if that helps.
best buy says they are 6.5 and 6x9 rear. To measure you have to get to them. You'd have to remove your door sill on the front, and possibly get under the deck lid for the rears. You might be able to measure from inside the truck looking up from the bottom. Just take a ruler or tape measure and measure the size. If it's round - it'll be 6.5" probably. If it's oval - 6x9.