TJ- negative. Inside the engine compartment, there are a bunch of drilled and tapped holes for mounting different option parts, and they are drilled and tapped for the same size bolt. I have been told that the bolt for the main engine ground, the one that comes off the battery, is the same size as the rest of these pre-drilled holes. Since I am looking to mount a few more toys in the engine compartment, and since every auto parts place out there sells bolts for various domestic and import vehicles, I am trying to find out if anyone knows the size without having to disassemble something in the parking lot of Kragen in order to have a part to compare it to. When I get off work in the morning I'll take a pic of what I am talking about...