I can answer this, I tried all the shift knobs of our line up! First things first, I am one of the biggest fan of the Desert Eagle on this face of the Earth. I've been using this shift knob in my daily driver for the past two years.
But in a car like the 2006+ Civic, it would not be my first choice. Basically, the shifter in the Civic has a dual bend that prevents a tall shift knob like the Desert Eagle to be threaded all the way down. If you want the shift knob to sit very low, it might not be the best option.
If you are not sure about the round shape of the M1 Abrams, you could look at the
Type R shift knob:
It's closer to the shape of the stock shift knob, can sit very low on the shifter and has a good weight too.
I hope this helps!
Frank
TWM Performance