I have found three variations of these. I believe yours are early Ford Pantera and the other is later; post Ford Pantera or sourced from one or another Peugeot as a replacement.
There is an intermediate version I have found in later Ford cars that uses a clip (clip and spring are not on adjuster in middle) to keep the slack adjuster from turning like the early, but is the same diameter as the late version that uses an internal tab to control the rotation.
If the sealing surface fails, like in photo two, that's it. I have not found replacements. Probably one of the EU guys would have better luck