I like the idea of wrapping chains aroun the rims to keep them from blowing apart. Tire shop I got to remove the old tires wouldn't remount the new ones for my 38 so I did it myself but I was real careful. Napa and some of the family run parts stores keep old books around and can cross reference for some parts. Advance Auto Parts and the like are nearly useless when it comes to older bigger stuff. Ten years ago Napa actually had a pressure plate for my 38 on the shelf and only thrity five bucks.
John