Today I installed a Rockford Fosgate P3L-S12 loaded enclosure and Fosgate R500-1 mono amplifier. The enclosure holds a single 12" shallow sub. This setup was a perfect fit for my 68' with Buddy Buckets. The box fit so well I realized I could run two side by side with no problem. My seat is all the way back with no problems. After listening to the sound I think two boxes would be too much. At least for me. It sufficiently rattles the rear view mirror.
Heres a crappy photo for now. Later I will dynomat the rear cab and cover it so it matches the seats.
