Aftermarket HU Wiring Harness Question

[Creelove]

I am considering upgrading my stock 1994 Ford head unit to an aftermarket MP3 player (Sony CDX-MP40 probably), but I would like to continue to use my existing Ford JBL Premium audio system. I went to Crutchfield, and they have an adapter that accepts speaker level inputs, but not line-level inputs. Do they make a wiring harness that uses the RCA outputs from the head unit? Also, what do I have to do about hooking up the switched power lines and such back to the amplifier?

Thanks,

Chris

 

[Creelove]

I answered my own question. I found the harness I was looking for on EBay. It's not the same one as the Scosche one with the speaker level adjustments on it.