In the photo below there is an unused bolt hole below the oil filter that I want use for a safety wire location for the magnetic plug. It seems to accommodate a 3/8 inch bolt, but I have no 3/8 inch bolt that matches the threads of the hole. Can someone tell me the bolt size and threads per inch to use here.
https://jimmccarter7132.smugmug.com/My-First-Gallery/n-qMcDSh/i-5sL4wGx
https://jimmccarter7132.smugmug.com/My-First-Gallery/n-qMcDSh/i-5sL4wGx