Replacement Bulbs > Bayonet to G4 Socket Adapter   Bayonet to G4 Socket Adapter (Double Contact) Converts a bayonet base (BA15D / 1157) to a G4 base. $ 2.20          Available: 1      More Information      Quantity:     Bayonet to G4 Socket Adapter (Single Contact) Converts a bayonet base (BA15S / 1156) to a G4 base. $ 2.20          Out of Stock      More Information