anyone replace their 2005/6 shaker1000 head unit and retain use of amp and subs? I had looked around about a month ago and thought I saw links to adapters etc to be able to do this but can't find them now.

I want to replace the factory head unit with the Alpine iva-w200 but I don't want to lose quality in the rest of the system - it sounds decent enough for the time being. I'll do amps later maybe but for now, anyone have links to parts or part numbers of adapters etc that will do this?

thanks a lot!