Here's that picture. I can't look up the info right now but will post the Ford and K-H numbers a little later. There was also an excellent article about them in one of the hot rod journals a while back. I'll see if I can find my copy of it and post the issue name and number. Stu
Edit - There were three versions according to old K-H and NWRA references. The earliest 18" x 3.62" having the wide five 5 x 10.25" pattern was K-H 20988 / Ford SE78-1015. The 5 x 5 1/2" pattern Ford wheel was K-H 23278 / Ford 01AS 1015A. The Merc number was K-H31873 / Ford 8CS 1015B or 1C 1015A. One of the references refers the 23278 number to the 31873 number and cites them in a kit. The last K-H reference to give these numbers is dated 1953. The Green Bible makes no mention of any of these numbers.
I can't find my copy of the journal article. Will keep looking and add its info when I find it. Stu