How can I tell?

How do you know if it has standard control arm bushings or eccentric?

The control arm bushing will either have the bolt hole centered, or offset to one side. It is the bolt that goes thru the bushing that may have an eccentric. Essentially this is a large washer that is offset.

Here is a pic of an offset bushing



Not sure if AOL will let me link those, so here is the web site they came from just in case.
http://hometown.aol.com/pwall5/cars/tips.html