https://www.mamotorworks.com/corvette/product/corvette-1965-1968-antenna-mast-nut-614417
1965-1968 Corvette C2-C3 Antenna Mast Chrome Nut 3863499 - 3863499
OE-style chrome antenna mast nut replaces missing or corroded hardware to secure the antenna and restore factory appearance on 1965-1968 C2-C3 models.
antenna mastcorvettechromenut