Attached are photos of the speaker I removed from my '68 C-150H. The entire diaphram is gone. No wonder it sounded "tinny." It's "Utah" brand (an Indiana company defuct since the 1980s). No repair kits available that I can find. Dimensions are 6.5 x 8.5 inches (mounting holes 6.75 x 4.5 inches apart).
The 4 x6 Quam oval speaker from AC Spruce will require fabrication of an adapter plate. I see that Shelby did this exact thing, probably with this exact same replacement speaker:
So, I guess that's the route I will take. I'll post pictures when I'm done.
