So I understand sizes like 1156, 1157, 9006, 9005 and such for bulbs, but what is this BA stuff? Like BA15 and BA9? They look similar to 1156, 1157, 2057 and such. Is it just LED styling?

If so then what are their equals?

Thank you

 

This may help. Bulb Base Information

 

Ah got it.

thank you z28pete.