Here, lets go back and try this again, so your feelings don't get hurt again. First off, the GC4 pocket castings are not interchangeable with any other model of GCs as they have a completely different mounting system, then, the GC4 rails and castings are a 1/2" wider than the 1,2,or 3 rails. Now, recessed pocket lip is not actually dropped down to mount the pockets, it's raised up around the pocket lip. So, the pocket lip and mounting screws are in the exact same places as they would be on any GC style castings, and yes that includes the Anniversary and Centennial models as well. The big difference is the basket is much larger, therefore the pockets hold more balls, the draw back is they also conflict with the frame under the pocket shelfs, they should be modified to match the same as a GC4 frame, but yes, you can still install the drop pockets, i just don't care for the fight to get them installed, so i modify the frames. Then, the lip of the pocket is also thinner on top of the casting which makes for a very nice low profile look. And i have to give credit where credit is due, Mark Gregory told me about the fit of the GC4 drop pockets years ago, so, I've been using them ever since. And unlike a lot of people here on AZB, Mark and i talk almost daily, because we don't consider ourselves to be competitive, we're better friends than that, and besides, there's plenty of work to go around if you know what you're doing.
Now, is that a good enough explanation for you?