This is a great write up on doing a stock 2 clutch refresh. The 2.1mm dog ear plates give you a little more bite than the 2.0mm. However, the most popular refresh is the 3 disk with 3 2.1mm plates. To do this you can remove the bottom spacer and insert 3rd disk/plate giving you 40% lock up. Check it out:
http://www.mye28.com/viewtopic.php?f=9&t=93418