After finding that the impeller in this 15-year-old dishwasher was broken by a few unpopped popcorn kernels, I was relieved to find not only the parts I needed, but a very helpful instructional video provided by Appliance Parts Pros. The model used in the video was slightly different from mine, but it was mainly sound insulation, side panels, and an additional ground wire, which were easy enough to figure out on my own.
Removal of the water supply line (which was not shown in the video) was more complicated than I anticipated because the original installation used a copper pipe, instead of a braided-stainless flexible hose.
Overall, the repair went smoothly as depicted in the video.