Where to buy a m14 x 1.5 self tapping double oversized oil drain plug?

You can purchase a M14 x 1.5 self-tapping double oversized oil drain plug from automotive supply stores, both online and in-person. Websites like Amazon, eBay, or specialized automotive retailers such as Summit Racing or JEGS may have what you need. Additionally, local auto parts stores like AutoZone or O'Reilly Auto Parts might carry similar items or can order them for you. Always check compatibility with your vehicle before purchasing.