According to the Wiring Diagram - 3' Lil Humbuckers, 1 Volume, 1 Tone, 5 Way Switch, 3 Splits (see diagram below), I am able to get the following combinations:
Pull (UP)
1u) Bridge - Single
2u) Bridge & Middle
3u) Middle - Single
4u) Neck & Middle
5u) Neck - Single
(Stock SSS Strat wiring)
Push (DOWN)
1d) Bridge - Humbucker
2d) Bridge & Middle - Split / Hum Canceling
3d) Middle - Humbucker
4d) Neck & Middle - Split / Hum Canceling
5d) Neck - Humbucker
Pull (UP)
1u) Bridge - Single
2u) Bridge & Middle
3u) Middle - Single
4u) Neck & Middle
5u) Neck - Single
(Stock SSS Strat wiring)
Push (DOWN)
1d) Bridge - Humbucker
2d) Bridge & Middle - Split / Hum Canceling
3d) Middle - Humbucker
4d) Neck & Middle - Split / Hum Canceling
5d) Neck - Humbucker