美国采购需求：滚轮、托链轮、链轮、惰轮、履带链、履带组

I'm looking for a replacement part, specifically the one associated with the excavator model I mentioned. This part is crucial for the machine's operation, so it's important to ensure it meets all quality standards. Could you please provide details on the availability, pricing, and lead time for procurement? Additionally, let me know if there are any alternative options that might be compatible with this model. Your prompt response would be greatly appreciated.