Don't know about this source, but I had it bookmarked when I was ready to order a replacement center speaker for my dash. It's inexpensive and may be an option:
4X10SPEAKER - THIS IS A REPLACEMENT SPEAKER FOR ANY
1966-78 MOPAR WITH A 4X10 FRONT SPEAKER. NOT A
REPRODUCTION OF THE ORIGINAL SPEAKER, BUT A HIGH
QUALITY REPLACEMENT. THIS SPEAKER HAS THE EXACT SAME
BLACK TOP SPEAKER CLOTH COVER AS THE ORIGINALS, AND
ONCE INSTALLED, IT WILL LOOK EXACTLY LIKE THE ORIGINAL.
WE HAVE USED LOTS OF THESE IN OUR CARS – THEY LOOK AND
SOUND GREAT!
Found on page 29 of this site:
http://www.rocketresto.com/files/Catalog.pdfSite also has two pics of speaker.
Let me know if anyone has used this speaker and what you think.