Grand Funk Railroad - "Heartbreaker" (Billboard #72, entered 2/14/70). Written by Mark Farner. Produced by Terry Knight. 45: "Heartbreaker"/"Please Don't Worry" (Capitol 1970). LP: On Time (1969).
The single and album versions both play for the full 6:30.
The 45 version of "Closer to Home" (linked to above) clocked in at 5:30, while the Closer to Home album version (confusingly titled "I'm Your Captain") stretched out to 9:47 on the album.
Grand Funk Railroad - "Mean Mistreater (live)" (Billboard #47, entered 10/12/70). Written by Mark Farner. Produced by Terry Knight. 45: "Mean Mistreater"/"Mark Say's Alright" [sic] (Capitol 1970). LP: Live Album (Capitol 1970).
Side B, spelled "say's" on both the album and single, is an instructive, polarizing document.