The Darker color exhaust wheel is the 70GTQ and protrudes from the housing has 10 blades , the compressor side has a black 12 sided nut and the nut is larger than the 6776 ........... The 6776 is brand new the exhaust wheel is silver and sunk in the exhaust housing with 11 blades , the compressor wheel almost looks like aluminum with a silver six side nut holding it to the shaft . The compressor covers are similar in size but the 70 has a flat side if what looks like in the pic machined bare aluminum . Enjoy