It's possible you're thinking of:
* Gunsmoke (1955-1975): This long-running Western series featured many guest stars throughout its run. To find specific actors and actresses who appeared in 1958, you'd need to specify the episode.
* Another Western film or TV series: There were many Westerns released in 1958. If you can provide more information about the film or series you're thinking of, I might be able to help you find the cast list.
Please clarify the title or provide more context, and I'll do my best to help you find the information you're looking for.