I just did a little bit of googling, and while I didn't see any that looked exactly like the ones in your photo, I found some at various sites that I think would work. I searched for marine 28-volt, 7.5-amp resettable circuit breaker. Alot of electrical websites have them. I even found them on Walmart's site.
2010 Fleetwood Southwind 36D
2003 Jayco Greyhawk 27DS