Headunit Headache

[boggers]

Im getting a kenwood ddx7029 (US ddx7019 equivalent) for my 2000 modell hoe. Witch wire harness adapter do i need to keep using my stock amp and speaker wires ? I dont want to reroute new wires. Ive been reading up abit and there might be a problem connecting it straight up because of the factory radio wiring through the stock delco amp?

BTW its not a bose system, i think its the premium with 8 speakers and a sub with the amplifier behind the glove compartment to the right. And i dont have onstar.

 

[boggers]

So ive had a look around and i found this adapter PAC ROEM-GM21A
99-01 GM SUV Kit. will this do the trick??

Also is it possible to wire the headunit up without one of these adapters and still get the factory amp to work with the new headunit? i guess chimes and bells will be gone but thats ok..