Finally. I know others have sourced something that sorta worked but here is an official repop.
Ames #FL670C THIS CAP HAS BEEN UNAVAILABLE FOR MANY YEARS. WITH ITS REAR HANDLE TABS AND LACK OF EARS ON THE OUTER EDGE, THIS CAP WILL WORK ON THE UNIQUE FILLER USED ON THESE EARLY FIRST GENERATION FILLER NECKS. QUALITY IS VERY GOOD. BRIGHT ZINC PLATED WITH "ANTI SURGE" "VENTED" EMBOSSING.