Both Ford and Dodge were using Dana axles in that year. Those look like the ball joints that Dana supplied with the original axles. I'm not surprised that an occasional ball joint has a Ford name imprinted in the metal.
FYI, Dodge/Ram no longer sells this OEM ball joint. You can, however, get the OEM ball joints from a Dana parts supplier and the pricing is reasonable. Just be sure to identify which of the Dana axles that you have---Dana 44, 60, 70 or 80. It's not complicated to figure out.
The Dana product should provide the best fit into the original products over any aftermarket manufacturer. My OEM's went 261,000 miles and were still road worthy although showing signs of wear.