Put up a picture of what you want to weld. 37 to 39 drums are not to hard to find. I just sold a full set of front and rears
We can help you post pictures, and/or someone can post a picture of one, and/or someone can answer if they'd risk relying on a cast iron weld with said part. And you need a hub, so maybe someone's got one with an out-of-spec drum ...