Do you have or know of a aftermarket speaker that will fit into the rear/B pillar of international 9000 series daycab trucks? Its supposed to be a 5x7 but every one I've tried would require trimming or modification to fit into the factory mount.
Most 5x7 are will have same bolt pattern. Some manufactures might trim off the usual multi hole mounting tabs for just the ones need for that application. About the only change would be the depth of the speaker determined by the magnet size usually. We sell OEM style that are not so deep. Here is the link to them as they are on a sister site
FARM RADIO SUPPLY