They may have the correct part in stock or be able to order it for you.
Option 2: Try a salvage yard or junkyard.
They may have a used circuit breaker from a similar car that will work.
Option 3: Check online retailers.
Several websites sell replacement parts for older vehicles.
Option 4: Contact a dealership.
They may be the best option for getting the exact circuit breaker you need, but it may be more expensive than the other alternatives.