According to Codex Baal Predator may take:
May take two side sponsons which are both armed with one of the following:
- Heavy bolers ..pts
- Heavy Flamers... pts
Unless he is using different datasheet for Baal Predator he is not allowed to take two different sponsons.
In addition to Main Gun and Sponsons Baal Predator is allowed to also take Strom Bolter and Hunter-Killer Missile.
That's it.