Hey all, why is there a difference between 96-04 8-bolt and 05+ 8-bolt flywheels? Looking at their spec sheet, the 96-04 8-bolt flywheel (part # 186481) weighs 12.75lbs and the 05+ "w/ upgraded 8-bolt crank" (part # 186051) weighs 12.00 lbs. What gives?