Hello and thank you for your inquiry.
With the advancement in lighting (LED and T5's in particluar) PC lighting is becoming increasing hard to find. Many manufacturers are no longer producing the bulbs, fixtures or parts. You may want to contact Current USA directly to see if they have any ballasts available that would be a direct replacement for your system.
If they are not able to assist, you could look at the CoralVue VHO ballast that while not a direct replacement would work for your bulbs:
Or you may consider upgrading your PC bulbs to T5 or LED bulbs at this time for a larger selection of products and replacement parts.
If there is anything else we can do for you please let us know.
Marine Depot Customer Service