3D model for sprocket kit

I need a model (stl file is fine) for the amazon part : https://www.amazon.com/Drive-System-Chain-Sprocket-Motorcycle/dp/B088ZZ555L/ref=sr_1_2?crid=1R87YBHAO92MM&keywords=Drive+system+T8F+Chain+%26+6T+gear+box+%26+Rear+sprocket+kit+for+mini+motorcycle+47cc+49cc&qid=1649955525&sprefix=drive+system+t8f+chain+%26+6t+gear+box+%26+rear+sprocket+kit+for+mini+motorcycle+47cc+49cc%2Caps%2C154&sr=8-2. This would be the Drive System T8F Chain & 6T Gear Box & Rear Sprocket Kit for Mini Motorcycle 47cc 49cc listed for $33.8. I'll need the chain and sprocket as a separate stl and the gear box as a separate stl. I also need a method designed to interface the gear box to a nema 23 motor. This would use the shaft coupler https://www.amazon.com/Aluminum-Coupling-Coupler-Connector-Hexagon/dp/B07R47C53C/ref=sr_1_2?crid=39DC6R3RP7WLN&keywords=sydien+aluminum+shaft+coupling+rigid&qid=1649955689&sprefix=sydien+aluminum+shaft+coupling+rigid%2Caps%2C145&sr=8-2 or similar coupler to connect to the Nema 23 motor's 8mm shaft. I can provide the stp file for the nema 23 motor.