superballs

hello. i had a panasonic tv installed 2 years ago, and the crappy shop in south florida that installed it, cut my wiring harness in pieces to make it work. so recently i reinstalled the stock headunit. bought a new wiring harness off ebay that the seller told me was exactly what i needed. the harness plugged right into the back of my stereo, the problem is, i had 16 wires comining out of my tl that needed homes and only 12 in the harness. now everything seems to work except the steering wheel controls. im sure the other wires have something to do with this. do you guys have any suggestions? is there a way to shove the wires into the harness? is there another place to get another harness that might work better? i dont mind that they dont work, but the lease is up in 4 months, and if they catch it in the inspections, it could cause major problems.
thanks