Thanks for the replies and suggestions. I was able to identify and purchase a Briggs & Stratton Locking Cap Model XO-1906 that would fit the tank inlet for the 8N Ford.
Good evening. I will be parking my 1952 8N Ford at an off-site location for some time and would like to replace the fuel cap with a locking type for security reasons. If known, please identify a locking type cap that will fit this tractor. Thanks.