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Only you, the owner/driver, can answer the question of Eibach (or any similar lowering spring) vs stock. Do you want stock ride height and softer ride, of do you want lowering and firmer suspension? Tokico is another good lowering spring, but they're pretty hard to find at this point. Vogtland seems to get good reviews, but I have no personal experience with them. Here's a link to one vendor for the high-quality bump stops referred to above. Pricey, but worth it if you're serious about good handling: http://www.fatcatmotorsports.com/FCM_bump_stops.htm

It's a spacer for the flex plate. You need to remove it anyway to mount your flywheel. Pretty sure it just pries off easily. Then the seal will be exposed.