My Lynch Rd 70 Super Bee has F 70 B on the trunk lid, which I think means F70-14 black wall (raised white letter) tires. No X, but I don’t have the broadcast sheet. No evidence of red paint on the drums, so I think it came with regular 14x6 steel wheels. My brother remembers his 71 318 Charger had an X on the trunk lid, and it had 14” black wheels with full wheel covers. I don’t know what plant that car came from.