I also used M&H and it fit perfect. It does help to have the old harness to reference things. There are no instructions, but it was pretty simple, just route wires where the old wires went. It also helps to have the factory assembly manual to see the wiring diagrams. It's kind of like a puzzle, you lay it out and things start making sense and going together. The M&H harness was an exact replica of my stock wiring harness. My car is totally stock and I replaced all the wiring front to rear. I put in the battery and everything worked on the first try.
I found the easiest way to change out the wire harness. I got myself some electricians # pads. As I removed each wire. I put a number on it an wrote down the location. When done I layed the 2 harnesses side by side and transfered the #s to the new harness. Went back in like a charm.
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