CD-220 to After-market Amp-Need Wiring Help

[ExplorerLyon]

I need guidance on wiring the CDR-220 to an aftermarket amp (Alpine). Eliminating the stock amp completely. Is there a harness or other option to convert the outs on the back of the radio to rca inputs on an amp? Where can I get the connector that plugs into the back of the radio to make my own harness if needed? Not wanting to change the head unit at this time. 01 Boxster, not the Bose system, no MOST.

Why? When I acquired my Boxster, there were some weird things done with the existing system. The front and door speakers are wired through the factory amp. Prior owner installed an Alpine amp in the frunk and tapped into the front speaker wires for the inputs. This amp only powers the rear speakers. I am simply trying to clean up the install, properly wire the Alpine amp directly to the head unit, connect the rear speakers to the rear output so the fader works.