On my Vanagons, I have replaced the front speakers with flush mounted MB Quarts. A vast improvement, and no need for crank modification. 
It has been a few years since I did this, so I haven’t checked to see what 4” versions they have that can be flush mounted still. 

> On May 19, 2019, at 4:11 PM, Mike Miller <mwmiller6@ATT.NET> wrote:
> 
> Great thank you. I had forgotten Crutchfield. They're kind of like the Tire Rack of electronics 
>