ISO 18.5" WSM Lid

Building a Weber Smokey Kettle, but in need of a lid. The kettle lid does not sit correctly, it goes over the outside of the bowl, the WSM lid goes inside the center section. I saw one on here posted a while back, but have not received any response from the seller, it was his only post on the boards. Used or new, do not want to have to buy one from Weber or a parts place if I can avoid it.

Thanks in advance.