Subject: Clutch assemblies for 99 Eclipse
Question: I have a clutch that is acting up. It could be (best scenario) a faulty slave cylinder. Worst case, it could be the clutch. If you would, could you tell what clutch assembly goes in a Engine Type 420A, which is a 2.0 DOHC.
Answer: Patrick,
There are plenty of clutches you can purchase for the non-turbo, 420A engine. Here are a few web sites that have some great information and good deals on clutches if you need to buy one.

http://www.roadraceengineering.com/eclindex.htm
http://www.machv.com/
http://www.extrememotorsports.com/ (may only have clutches for turbo models)

If you can't find what you're looking for, give them a call. They should be able to point you in the right direction.
Good luck!