Also I found these which may work: https://www.woofersetc.com/c-23-subwoofers/c-179-6x9-subwoofers/hd-690cf-2-cdt-audio-6-x-9-125w-rms-2-ohm-carbon-fiber-subwoofer.html
Have you tried the 2 ohm kickers that you recommended? And did you find the actual connectors that work? I see the metra 72-5601 is similar to the connector I’m not sure if those will work.