This looks later than what you are looking for, but it does list it as a discography for both of them at this site. Not sure how accurate it is as another site I went to had "Lonzo" listed as "Ken marvin" while the one below lists him as a "Sullivan." Hope this helps some, at least.:-)


Lonzo and Oscar.
America's greatest country comedians.

Starday SLP-119, [1961?]
PHONODISC DMdl 2187
Country music time.

Starday SLP-244, [1963?]
PERFORMERS: ; Lonzo (John R. Sullivan) and Oscar (Ronald Sullivan), with ensemble.
PHONODISC DMdl 2188
Lonzo and Oscar : country comedy.

Hilltop JM-6021, [1964]
PHONODISC DMdl 2186
Mountain dew.

Columbia CS 9587, [196-]
PERFORMERS: Lonzo (Johnny Sullivan) and Oscar (Ronald Sullivan); with ensemble.
PHONODISC DMds 6773