Speaker locations for 74 Duster.

I finally got a cheap stereo in the Duster yesterday and am having a upholstery shop make me a carpeted shelf today for a couple of 6x9's.

The shelf will fil the gap between the exhisting shelf and the fold down back seat but still allow it to be functional.

My problem is, where do I place some smaller speakers up front?

What have you guys done?