The key pictured below, part # T-5815, was produced for only a three (3) month period from April 12, 1913 through July 10, 1913. According to company records there were 61,495 cars produced during this time frame. The design change was to eliminate the square hole for the Prestolite tank valve and the 5/16" hex hole for the coil vibrator nut. Help is needed to find this key or a quality photo of it. Please PM me with a response.
Thanks,
Don