http://www.westernclippings.com/radiorangeriders/buckjones_radiorangeriders.shtml
"...With the same theme music as Buck’s Universal Westerns and sponsored by Post Grape Nuts Flakes, a character named The Old Wrangler narrated “Hoofbeats”, a serialized story of Buck, his horse Silver and sidekick Red River searching for the Dagger Hilt Gang who killed Buck’s father and two brothers. Buck pitches his Buck Jones Rangers Club on the show and offers premiums such as a red and gold metallic pin and a booklet with “lots of prizes” redeemable by sending in a certain amount of Post Cereal boxtops. (Lariats, chaps, hat, etc.).

Several episodes of this rare series can be found and listened to on the internet."