8 The Custom Autosound 6x9 speakers were installed next. We installed them in the inboard stamped opening on either side of the factory single 6x9 opening in the center. Again, small mounting holes were drilled for securing the speakers, but no major cutting was involved. After 35-plus years, many hardtops already have 6x9 holes drilled, so someone may have saved you a step. Here you can see where the speaker and CD-changer wiring is tie-wrapped up out of view for a super-clean installation.