All engine, transmission, and final drive unit drain plugs and filler caps must be visibly safety wired. Oil filter bolts must be secured with safety wire and spin-on oil filters must be secured with a metal clamp and safety wire or other acceptable means. Fuel and radiator caps are exempt.
What I wired last year: oil lines with banjo bolts in front of engine (2 sets), clamped oil filter and wired, radiator cap, and drain plug. I placed grey rtv sealant around the small circles on the right side of the engine (I'm assuming these are the remaining engine, transmission plugs). This is what I am concerned about. This passed inspection last year, but I don't want to be in a situation where I'm running around the pits looking for 1/16" bits. 8)