Hello from the new guy!

Looking at aftermarket navigation options for my 03 Supercrew. I've done as much reading and calling as I can and am still in the dark about getting a double din nav system to fit into my dash without having to "grind to fit". Any of you guys have any ideas/experience with this...and if so which models provide the best fit?

 

Thought I looked through the forums well enough....but I didn't...found answer under Head Units post.