I jave these discontinued Rockford Fosgate shallow subs only requires just over 3.5" of mounting depth. these subs have been tested and working asbthey should with no issues. Hard to find oe Aluminum trim ring they just need a good cleaning and polish. Don't hesitate to get your hands on these beauties. Any questions feel free to ask 400 rms each 800 watts max Dual 4 ohms