Don't have first hand knowledge of what Gulfstar used but my experience the breakers are pretty much standard. I ordered some replacements for breakers on the panel in my 1984 Pearson from Defender and they were identical to the old ones.
Maybe a photo of the breakers would help to confirm.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
Thanks to all. Still did not get to the boat for pictures, but found the DC breaker at Custom marine Services in Murrells Inlet, SC 843-230-3536. Airpax Breakers