Danny was very responsive (Thanks, Danny). The answer was that one of the wiring harnesses was missing, and will be sent to me shortly. Whew! I thought maybe I was missing a few brain cells.
I still do have a question, however. I would like to do the one-woofer forward/one-woofer backward configuration to reduce 2nd harmonic distortion, but I'm not sure how to hook up the servo wires to the backard-facing woofer. The tab sliders are color-coded and sized for the correct tabs assuming a forward-facing woofer. I know I need to reverse polarity for the other woofer, but I'm not POSITIVE about what to do with the other woofer's servo wires.
BTW, I just ran a short test on one of the sets of woofers (both facing forward) and (so far) I am pretty impressed. All I did was play the right woofer channel by itself using the Stereophile Test CD 2 with the woofer decade, 200-20, and I got very clean-sounding output down to 20. I still need to check how they blend with my Sound Lab ESL's, how well they play symphonic music and how they do with transients. Stay tuned.