You can try
https://www.jthomasparts.com/520-954-carburetor but it's kind of expensive. Consider instead just searching for "Tecumseh LEV115" and studying the pictures provided to match the one you had.
You didn't mention why you're looking for a replacement carburetor. If it's just that it's gummed up inside, consider cleaning it. Even if you mess it up, you're no worse off than you are now.