Can you finally add M300 Dual extruder motor and/or sprocket wheel to the store? They get used over time or damaged like any other part and it’s completely unreasonable to buy the whole extruder assembly when only one of those parts needs replacement.
Both of those items can be purchased for M300, M300 plus, M200, all sorts of printers but not for the Dual type.
You have the suppliers, you can stock them, you just refuse to do so. And it’s such an anti-consumer behaviour!