The EC44 headset consists of the parts shown in the image below (plus compression plug assembly), and is compatible with any bicycle that uses an EC44 (44mm) straight head tube and a fork with tapered steer tube (1-1/8″ to 1.5″) steer tube fork.

The Integrated Headset consists of the parts in the image below and is compatible with bicycles that use integrated tapered headsets (IS42 / IS52) and a fork with tapered steer tube (1-1/8″ to 1.5″) steer tube fork. This headset is for use with the Traildonkey 3.