Nothing cosmic here, been done before. But so simple and almost silly not to do if you listen to music in your 80.
Prior owner replaced the original rear door speakers with the 4in Kicker DS400's.
https://www.amazon.com/Kicker-07DS400-4-Inch-100mm-Speakers/dp/B001JE5SXU
While this was likely an improvement over factory I wanted more.
The Pioneer TS1645R 6.5in fit without any modification to the door.
https://www.amazon.com/gp/aw/d/B00N...r+tsg1645r&dpPl=1&dpID=41LQDWpQ0TL&ref=plSrch
Downside for some is you have to drill through the door card/panel but not a problem for me. I painted the grills with Rustoleum Textured Bronze 7226380. Match is almost perfect.
Mid range sound is much improved! Well worth $30 for speakers and 30 min or so to install, clean-up and take a couple pics.
If anyone wants my old speakers/grills I will post them in the classifieds.