'10 factory radio harness?

[tlw00dy]

Well, I'm busy making my first mod ; new speakers and an amp, and I'm not even two weeks into ownership! With some help from this forum (I'm a total newbie), I bought... Got this from onlinecarstereo.com... Kenwood KAC-8404 (4 channel amp)StreetWires PSK08BI (the wiring kit for installation) Got this from Crutchfield... 107DB651 Polk Audio db 651 6-1/2"/6-3/4" 2-way Speakers107DB651 Polk Audio db 651 6-1/2"/6-3/4" 2-way Speakers000CARCAT Current Crutchfield Catalog Car Bounce Back000PIPENV Envelope barcode Outgoing packages000SPKRIG FREE Crutchfield Guide: Full-Range Speakers Installation000SRSAIR Airbag Fact Sheet Crutchfield Air Bag Fact Sheet12071035 Toyota Wire Harness speakers142SAC656 GM/Jeep SAPs 5.25"/6.5"12071035 Toyota Wire Harness speakers142SAC656 GM/Jeep SAPs 5.25"/6.5" I just bought the two pair of speakers and crutchfield put all of the rest of that stuff in the order. I think its some brackets and the wire harness. I'm trying to find somebody to install it. I didn't want to just use the big box stores. Figured I'd spread the wealth locally. Lots of folks around here needing money.One of the potential installers says I need a wiring harness to get from the factory stereo to the amp."well the problem that sticks out now is the amp will not run with just a power, ground, and speaker wire, its going to need rca wires which come with the kit you bought but the factory radio does not have the rca input in the back of it which is why you would need to find a harness for the factory radio that has the rca input and remote wire because both of those are needed to power the amp. Um, i will do my best in finding one for you, what I'd suggest you do is call crutch field and ask them if they carry the harness adapter for the factory radio that has the rca and remote wire so you can hook up the amp."I called Crutchfield and they didn't have anything for the '10 Vibe yet. Not even in their database. Actually, I wanted to get a Kenwood head unit with bluetooth, but was concerned when Crutchfield didn't have the faceplate thingy.Another installer says I need "a pre out box that converts wire going to the speakers in a rca output also a lil bit better sound quality"I'm confused about both of these, because I could swear the amp said it had load level (speaker) inputs. Do I actually need something else?Little help?