it is rare to see the bolt head as they are fitted on the "inside " of the wheel assemblies (either large or narrow pair)
most of the time you see only the nuts
Seems the tabs were used on each and everywheel
From pictures taken during restoration of Littlefield's panther found on internet (the one i put above is from the Wheatcroft collection) you can see the small tabs
Graham Pipe has spoken of those " bolt retainers" on panther wheels in a post related to the tiger I (nerdy wheel question)
Regardsgraham pipe wrote: ↑Sun Jan 12, 2025 11:26 pm........ The bolt heads did not show as they were on the inside of the wheel and held from rotating by use of pressed U section lock plates. We had to make over 1000 of these for this project by laser cutting then forming in a special press tool. ..............
Best regards from Normandy
Didier