Ok, total there are 12 bolts that mount the fiberglass underbody to the chassis. Here are there locations: Trunk. 2 bolts in here. To access the bolts, pull up the carpet (and board insert if applicable). The bolts screw mount, to the inside of the shock towers. Passenger Compartment. A total 6 bolts here, and all mount to the side of the chassis back bone. The bolts that hold the seatbelt receptacles in. The remaining bolts are located fore and aft of these bolts. To get to the remaining bolts, you will need to pull the carpet on the center console back. If unsure of location, you will can feel the bolts under the carpet. Engine Compartment. Total of 4 bolts. 2 are used not just to secure the undebody to the frame, but they also hold the crossbrace in place to strengthen the chassis. They are located to the front of the engine compartment, and bolt just inside of the rear shocktowers. The final two bolts are a bit trickier. Unlike the other bolts, these mount from inside the fiberglass body, and into the chassis. If you are a bit double- jointed, you can access the left side bolt by removing the access panel for the carbon canistor. Otherwise, the only way to access these bolts is to remove the rear facia. On my car, 3 of the bolts in the passenger compartment had completely fallen out. and two of the bolts in the engine compartment were loose enough that I could simply hand tighten them. The remaining bolts still had a bit of room here and there that I could hit them a little futher in. Previously, I thought that I was the only person with loose bolts. But now I see that I'm not. It wouldn't hurt for every one here to give the bolts on their cars a good once over. I can't remember the size of the bolts, but I did use a 12' extention where I could to get the bolts in as tight as possible. -Robert vin 6585