Speakers, 32 Ford Tudor Sedan

I'm about to the point of needing speakers for my car. It's a 32 Ford Tudor sedan. I have room behind the front kick panels and in the side panels ahead of the rear seat. But, these speakers need to be thin, as there will be no exposed grill on any of them. They will project sound thru the fabric. Most of the new speakers that I've seen have a grill that protrudes a bit creating a look that I don't want. So, I would like some suggestions for different speakers (kinda medium priced) that might work for my application. The fronts could be as large as 6" round, the rear a bit bigger. Maybe 6 X 9.

Thanks for any assistance

Jim