[sick472]

Consider getting a piece of carpet (or canvass, rubber, or whatever) that closely matches your carpet (or nicely contrasts/accents it) and cut it so it lays over the transmission hump (close to the seat). Attach the speakers to it, one facing left and the other right. This can be slid under the seat when not being used or displayed and can be accented by a tissue box style cup holder thingy that would sit between them. Those speakers look time specific and should be seen when showing the truck off.

If you have the stock in-cab tank, you will not be able to get one in on the driver's side unless you remove the tank.

As far as the tape deck, CB style mount low and center unless you have a manual shift on the floor.