You don't need that doodad to work I just bought the harness apaptor for like $18 and it works fine with my 460. It is louded than factory sound alot better.
No I got mine from www.thezeb.com but they no longer carry that model I linked (I got it for 208 shipped to my door). The pioneer deh-p7600mp is a great cd player that had exactly what I was looking for. Crutchfield over prices all there items and you don't need that doodad I purched a harnes kit from a local audio shop for like $18 and it works great with my mach460 system. It's cheaper than the one you wanted and has more features