There is a thread on speakers if you type it in. In short, need to remove the bench seat up and out, The arm rests need to be removed and the seat backs, 2 bolts...Should be able to get out from there. Take care as my 65 had a styrofoam "gasket/baffle" that was between the metal back plate and speaker. I almost got the whole thing out intact. also check out
www.taymanelectric.com