Yesterday at Carlisle I pickup up what appears to be an original 69 400/435 smog pump, 298 GJ diverter, the 90*diverter adapter, both correct hoses and 2/69 clamps. It is dated for May 16, 1969 with a 3925522 pulley, but it is black, not gray. The TIMJG shows all 427 pulleys were gray phosphate plated. Do I need to locate a gray pulley or was there a color change?