Custom Sail Panels?
 

I'm kicking around the idea of building custom sail panels to more my tweeters from the A-pillars. The approximate measurements of the sail panel area are 6x6x8.5. I want to find another car's sail panel that's close to these measurements so I was wondering if anyone knows of a car with sails that approximate size? It doesn't even need to have a speaker mount for it, that would just be a bonus. I may go down the 3-D printing route, but since I don't have a 3-D printer yet, thought I'd try this way first.

TIA!