On my 1969 Camaro, there are 3 light per side for the tail lights. The outside socket takes a 1157 bulb for the parking, stop and turn signal. The middle socket is for the back up light and takes a 1156 bulb, I believe. What should be with the inside light closest to the middle and trunk lock? I thought this should be a 1157 socket as well for the Parking, stop and turn signal like the outside socket, but on the harness I have it has a socket for another 1156 single element bulb. In this configuration, the inside light is always bright like the stop light on the outside socket. Is this correct?