Your options may be limited by what's behind the speakers in the wall and the mounting depth ... and in some cases won't allow you to modify anything to increase the depth.
I just returned a really nice set of marine speakers back to Amazon due to the mounting depth problem on my FR, and ordered another set of factory speakers ... which were Pyramid MDC6 in my case which are also on Amazon.
You might want to pull a speaker and measure the space available and compare to speaker specs you might consider.
2009 Salem PT 403FB
2005 Ford XLT Supercrew