no the diameters of the flywheels are not the same, The D16Z6 is larger then the D15 with the cable tranny, I pulled the 1.5 flywheel and bolted onto the D16z6 so it will fit into the cable transmission, the D16 flywheel would not fit into the tranny because the axle is in the way so I put the smaller flywheel onto the d16, The D16 block and the 5speed D15 transmission are interchangeable correct? I am going to use this clutch for now as just a daily driver, this one still has alot of life left in it, ill upgrade to a racing clutch the next round