Hey all, I continue to do research as I prepare to install a 2 DVD player in my 05 with JBL and Nav. I ordered the TYTO-01 harness to keep the JBL Amp and the Schoche 2 DIN model 010TA2103B. In another post I saw someone mention that another harness is also needed, the metra 71-8113. True or false? I mocked up my order on Crutchfiled to see what they were going to include an this wasn't listed. Thanks.