What,s different about them? Can they be used on 1.8 2.0
Seems they have more value than the rest.

the threads for the adjusters are the same size as the 911 swivel feet.
So you can use the swivel feet instead of the stock adjusters

The later 2.0L rockers were larger diameter, so you cant retrofit swivels.

AH!

And they interchange on whatever size engine.

If you use swivel feet, you will need to grind a bit of the rocker face off. Lots of threads on that, and it's easy to do.

Now - if you want to talk about rocker ratios, then that is a topic of it's own....