Been a while since I've been active here, but I have a problem, and I'm hoping maybe someone can give me a hand. So I'm going to best buy to have a stereo installed, mostly because the monsoon system scares me to much for me to want to do it myself. The installer realized the original harness he selected wouldn't work, so after some searching we found this harness. My question is, if I was to use the metra 99-3303, would I still need this wiring harness? And if not, would I need anything in place of it, or does the 99-3303 cover this?