If you're looking for some effective crab flies for permit the Palometa Crab from Enrico Puglisi is a great place to start. Palometa in Spanish for permit and this crab fly was named well. We love these fishing the Caribbean waters of Mexico and Belize as well as Bahamian waters that have permit like Crooked and Acklins. They are extremely effective crab flies for permit one of the toughest and most frustrating saltwater flats fish on the planet.
We typically use the #1/0 to start and use the #2 as a throwback fly or if we are in shallow water.