Basically, any coax speaker will work.
I did a ton of homework on plastic repair when I was trying to make the Vintage Air stuff fit, since I wanted to retain the lap blower section.
Here's my references I saved for future projects:
Hemming’s Motors brief article on auto plastic repair:
https://www.hemmings.com/blog/2012/0...ding-plastics/
Polyvance Plastics Plastic Identification reference:
https://www.polyvance.com/identify.php
Intro to Solvent Welding Plastic:
http://nerfhaven.com/forums/topic/18...lding-plastic/
Book of Plastic Welding & Repair: (Free download)
https://www.polyvance.com/thebook.pdf
Your seats look great, did you just recover the original foams?
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song:
http://www.youtube.com/watch?v=7zKAS...ature=youtu.be