You come close, Pilgrim, but no cigar.
It is Rio Bravo and El Dorado. Also Rick Nelson and James Caan.
Rio Lobo was one of the poorer ones with George Plimpton, the WASP who tried out different professions ('Paper Tiger' as a Lions qb) with a bit part.
Dang it! You're right...I stand corrected...but as I recall...then that Rio Bravo was still a Rio Lobo clone...I'm almost sure of it...which would make 3 versions of the same film. I remember they wanted Ricky Nelson because he was the hot new teen singer and Angie Dickinson for sex appeal....
Hey does anybody know what happened to the Duke's old gang of cronies? Edward Faulkner, Bruce Talbot (??), and there was another....?