There is information presented here that contradicts this. It appears the implication is that the spoke protector should mimic the OD of of the largest sprocket on the freewheel. Since the base Continental for example used a smaller OD freewheel, it uses a smaller OD spoke protector. The catalog pictures as bad as they are seem to confirm this.
Since the bigger SP would obviously work on all these models, who's to know for sure what it was actually used on on the production line.
Our collective best guess is that these were definitely used on the 15 speed models and maybe on other models. Right?
Added 2/7/16
1961 1/2 - 62 Continental an Varsity used the 4 3/8" Huret Solid protector to match the 25T freewheel
1963 Continental and Varsity used a 4 3/4" Solid Huret protector to match the 28T freewheel
1962- 1963 15 speed Super Continental, Sierra and Superior used the 4 3/4" slotted Huret protector for the 28T freewheel that was used on all of these