I think only one of this genre was ever made:
A vampire movie in the Old West of America with a cowboy vampire.
? ? ?
Cowboys and Vampires (2010)
Dead West (original title)
Plot Summary: Dead West - or The Rise of the Horror Genre and the Fall of the Western
Plot Keywords: cowboy, vampire
Jasen Wade ... Johnny Dust
Curse of the Undead (1959)
starring Eric Fleming (Gil Favor of "Rawhide") and Michael Pate (who frequently appeared in Westerns, including "Rawhide", generally as an Indian aka Native American)
From IMDb: The cinema's first vampire Western! Young women in a small Western town are dying one by one of an unknown malady involving massive blood loss. The Carter family's ranch is being terrorized by ruthless land baron Buffer. And a mysterious black-clad gunfighter with an aversion to sunlight has just arrived in town.
My younger sister and I would watch this every time it was on TV; yes, that was in the Sixties. Sadly, it's been very rarely shown in many decades. *sigh*