Well I'm not 100% positive about the wiring for the HU, but i'm going to assume that the spkr wiring isn't going to be a hassle for u and that the normal Kenwood harness will work.

In terms about the kit...if i didn't know ANYTHING about fabricating some sort of kit for the HU, i'd take it to a pro. I'm not sure how the kit Crutchfield gave u is and how it fits in your car, but u might have to attach some extensions to fit the old HU frame. Or at least that's wut i would be thinking of to do.

Post up some updates when you got it!