Actual kiwi, sorry I think I've stuffed up, I think I only saw one pic, but those two pics look identical to me, and are Plunger ones.....I think I need my eyes tested, but Swing arm and plunger models are in the same '54-'57 parts list that I have, but further down, and all the internal components are different
**Edit;
Back at the ranch now so adding a screenshot of '54-5 S/A hub from the list I have...
**Later Edit; Figure that a Piccie with drawings and numbers works better with a Piccie with the Numbers, more numbers, and Words so added it....;