美国采购需求：张紧轮、皮带轮、后减震器、优质减震器、滤清器、轮毂密封圈

I hope this message finds you well. I'm looking to gather some detailed information about wholesale pricing for car seat parts. Specifically, I'd appreciate it if you could provide a breakdown of your pricing tiers along with any quantity discounts that may be available. This will help me better understand the options we have for larger orders. Additionally, if there are any minimum order quantities or lead times we should be aware of, please let me know. I'm keen on establishing a reliable partnership, so any details on your products' quality and specifications would also be beneficial. Looking forward to your prompt response!