Reinstalling CDR220

[Bala]

I took out the Kenwood flip-up head unit and the amps and all the souped up stuff out. Now need to reinstall the original CDR220. I'm sure the Kenwood install required some mod to the original harness. Where can I get some help with the reinstall steps. I'd like to do it myself. I have the original amp and the speakers and would like to add the iPod connectivity to the Aux input for which there is plug and play cable available.

Thanks.