Yes, Briggs and Stratton versions were available as well (1935). Both the Hurd and the Briggs & Stratton locks used the same key blank/groove for the spare tire locks (in years 1936 autos; 36 thru 39 Pickups. Also the code is stamped on either version of the '36-39 cylinders. The 1935 auto locking Hubcap looked the same, but the lock cylinder was different for the Briggs and Stratton version (used a groove 16 B&S/Basco key).
Regards,
FlatHeadCoupe