Owen, just for clarity:
There are "pins" and there are "contacts"
SBC identifies a bulb / plug with two contacts.
SCC means the bulb or plug has one central contact.
These items have two parallel pins which means the bulb or plug can be fitted two different ways.
Im not sure about this but I believe SCC stands for single center contact. This makes sense. (to me)
However along with that goes SBC or single base contact(s)??????.. which doesn't make sense. The only conclusion I can think of is that it differentiates from a double base bulb like a festoon bulb? Anyone clarify?
Anyhow a gun tail light assy would use double contact plugs and sockets to allow for a feed and an earth return.
Then, just to stop it all being too easy "they" made (single filament) bulbs, plugs and sockets with offset pins
