If you want an E12 for yer ceiling fan is so easy to just cut off the E27 base and wire the remaining part to an old burned out E12 LED base. As fate would have it they mate perfectly together! Hot melt glue and/or tape and yer done!
Bret Cahill
99 Cent Only Store is now selling 5 Watt E27 LEDs. They pay for themselves in a couple of months if yer like most people and never turn off the lights.