As it seems no one on the Internet has ever explained how to install such an oil pan before, so here it is. My oil pan arrived without even a word of explanation, yet the operation detailed here is fairly important. As in, your engine is toast if you try to start it without doing this. Now that the Thai government has prohibited importation of all used motorcycle parts, my engine is now completely irreplaceable. So that would be bad.
2006 and earlier GSX-R1000 models had the oil pressure relief valve sandwiched between the engine block and the oil pan. In 2007 Suzuki moved the valve to a new housing closer to the center of the oil pan, connected by a passageway to the original location. In the original location they replaced the valve with a simple cylindrical connector gizmo with o-rings at each end so that oil would still flow to the new valve location. This gizmo is popped out by hand and discarded, and the oil pressure relief valve is flipped top for bottom and inserted in its place. This should become clearer in the photos below.