I found the thread I was referencing earlier, relevant info starts at post #22. The 255/40/18 front and 275/40/18 rear have the same outer dimensions as 255/35/19 and 275/35/19, and 513Ms are the same width and offset as my 437Ms. In theory, this should fit without rubbing.
https://www.e90post.com/forums/showthread.php?t=1368356