I've just fitted JConcepts over the stock AE and chose these over RPM. I've heard the RPM are stronger but the JConcepts a tighter fit but having no experience of the RPM cannot confirm. The RPM are a bit cheaper but I think the cost difference is due to the JConcepts coming with enough regular ballcups to do your entire car PLUS they come with 4 (I think) of the angled ballcups, so you get more parts for your cash.
The JConcepts did seem to take some of the slop out of the linkages but you will need shorter rear turnbuckles if you want to use the special angled parts, which are recommended for the outside rear only.
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