1967 Coronet tie rod end grease fitting size and type?

[Ghostrider 67]

There needs to be a sticky of this info. There are several sizes and types of "Zerks" available. Which ones go in the 67 Dodge tie rod ends? Straight body or tapered? 1/4-20, 1/4-28 etc? Thanks. I need to know and the parts/service manuals do not specify.