I spotted this on EBAY and thought someone on the forum might be able to use it. I believe it is the second style they used in 1966. Seems quite reasonable except the seller doesn't seem interested in shipping.
https://www.ebay.com/itm/285186011585?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=c9yAsOr9Tj-&sssrc=2349624&ssuid=E_nguBLnSuu&var=&widget_ver=artemis&media=COPY