Formula S lug nuts

If "close" works for you then check out these (assuming you've converted to all right hand thread). https://www.ebay.com/itm/20pc-Lug-Nuts-Chrome-Bulge-Acorn-7-16-20-1-9-Tall-Fits-Chevrolet-Buick-Pontiac/311943734690?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649
otherwise here's the link to the real deal:
1965 1966 1967 1968 Plymouth Barracuda Valiant NOS MoPar LONG Lug NUT Set | eBay
BTW, neither of these are my auctions - no connection to either.