Corner Speaker Install for 67-72 Pickup ?

[Ironhorse]

Anyone have pictures and some tips for installing 6x9 speakers in the cab corner on a 67-72 pickup? I moved the tank to under the bed couple years ago and am now thinking I need to take advantage of the space and install some decent speakers. Don't want to go the sub boxes route, want to have the available space behind the seat for storage so am thinking of mounting speakers in the corner, just not sure what would work best.