i have the one from crutchfield, the exact one they would send you, but it doesnt have the rca's on it. i dont know the model number for it, but the one i was told to get was the Metra 70-1786. that one has the rca's. im not using the one crutchfield gave me nor have i used it, due to the fact i bought a european version of a clarion, so it plugged right in. if you would like the harness, let me know, ill sell it very cheap to get rid of it. so to recap: the harness crutchfield sends you will bypass the amp, and the 1786 would use the amp.