I have a spec aluminum flywheel but ran into a problem when I went to use the stock ford alignment pins for the pressure plate. The alignment pins are larger on one side which is the side that is normally beat into the flywheel. When I went to put them into the spec flywheel only the smaller side of the pin fits into it.. and only the smaller side fits into the pressure plate. Ive been having a vibration problem with this car which I believe is related to the pressure plate not being center... If anyone has run into this problem please let me know how you resolved it.