You need to be a bit careful about playing too rigidly from a hand chart (even if you find one appropriate for 6-max). That approach makes you too predictable and easy prey for the better players.
Use your normal strategy, but adjust for the reduced number of opponents. Under the gun at a short table is more or less equivalent to mid position at a full one. The button and cut-off play pretty much the same in either case.
As a rough rule of thumb, any pair and any two high cards from Jack-Ten upward are likely to be playable from the first two seats after the blinds. From the button and cut-off, you can probably add any Ace, suited Kings and (possibly) suited connectors. Tighten or loosen from this stance, depending on the level of aggression or passivity displayed by the opponents.