T&T: Electrical Breaker Source

[Toby Clark]

I need the wisdom of the list in helping me find sources to replace an
electrical breaker.  My vessel is a 38' foot Present made in Asia in 1983.
I can find no name on the AC breaker panel or on the broken breaker.  I need
to replace what I think is a 15-20 amp breaker with a 30 am breaker.  West
marine does not have this "old" style.   What are my other sources of AC
electrical parts?   

Toby Clark 
M/V Consort
38' Present 
Charleston, SC