My J code May-68' SJ built coupe had a white one on the passenger side, black on the drivers side. Found a white one on a 68' 390 Fairlane in a wrecking yard, on passenger side. Unknow build date or plant. I assume the engines were built at different plants, or were the SB and BB engines made at same plant? Looking at the "Close up of engine" photo in the "engine installation" thread in the San Jose assembly plant section it is hard to tell what color the separator is as the flash produced a glare in that area. it appears lighter color, but so do the wires. Mike