As far as I know, there is no stock power cord with Sutherland phono stages. I bought a used Insight and upgraded to the linear power supply and spoke with Ron Sutherland who guided me through the board install. Really nice guy. He said people want to choose their own power cables so he doesn't provide one. The phono stage power cord is the most important one since it is at the very beginning of the signal path.
The cord could be a pretty inexpensive way to improve the sound, especially since you have the LPS on the 20/20. Nice phone stage.There are always close outs on cables and a decent $100-200 cable should provide a big benefit over whatever "stock" cable you have.