Tracklist
| Heartbreaker | 6:30 |
| Please Don't Worry | 4:16 |
Versions
| Category | Artist | Title (Format) | Label | Category | Country | Year |
|---|---|---|---|---|---|---|
| 2732 | Grand Funk Railroad | Heartbreaker / Please Don't Worry (7", Single) | Capitol Records | 2732 | US | 1969 |
| CL 15632 | Grand Funk Railroad | Heartbreaker / Please Don't Worry (7") | Capitol Records | CL 15632 | UK | 1969 |
| CL 15632 | Grand Funk Railroad | Heartbreaker / Please Don't Worry (7", Single, Promo) | Capitol Records | CL 15632 | UK | 1969 |
| 2732 | Grand Funk Railroad | Heartbreaker / Please Don't Worry (7", Single) | Capitol Records | 2732 | US | 1970 |
