When I started building a graphics kit designer for dirt bikes, I assumed every bike needed its own kit. It doesn't. Manufacturers reuse plastics across years and engine sizes, so a kit cut for one bike often lines up on several others. The 2023 Yamaha YZ450F kit, for example, also fits the YZ450FX, the YZ250F and the YZ250FX across 2024 to 2026. That is eleven model and year combinations from one set of panel shapes. So the useful unit of data is a reference bike plus the list of everything ...