What is the correct 6 volt tail light bulb for a Bonanza BC1300SH?

#1
I bought what I thought was the correct new tail light assembly on Ebay, advertised as being for a Bonanza Minibike.
Turns out that it came with a 12 volt 1157 bulb, which wont work on a 6 volt system.
I think that I am looking for a 2 element bulb, that will work with both the running lights, and the brake light.
Can anyone tell me what is the correct bulb?
 
Top