Yes you need to remove the both rings from the caliper and the carrier guide and bushing.
Sometimes an image is worth a thousands words. It shows the two rings that clamp the boot.
http://www.verschleissteile-direkt.de/pics/Rep-Satz%20Bremssattel%20VA%20Audi%20200%20S4-C4%20V8%20Girling%20UFO.jpg


Beste Grüße
Tim