Ranger Point Precision does not sell Marlin OEM factory replacement parts. We can help point you in the right direction. We recommend the following websites that specialize in OEM parts for firearms of all types and have schematics to help you identify the part / SKU that you need.
Midwest Gun Works https://www.midwestgunworks.com/marlin.html
eBay is also a great place to look for a factory part once you know the correct name for it and SKU