LF: Compact 150w MH Ballast

[warriorcookie]

Looking for a compact MH ballast for my aqua-medic fixture. Ideally I need a 150w hqi ballast. Like this one. Dimensions around 5" x 3.5" x 1.5"

Problem is it needs to fit inside the fixture, can't be an external ballast.

I would be interested in higher wattage, but I would need two then. Otherwise if 150w I just need one.

Thanks
Matt