I'm guessing they would be made from an LDPE material with a softening point of around 180-220ºC depending on blendHmm, not of the completely demolished examples. Didn’t think to take a pic and the bin’s been emptied over night.
Here’s an example that’s clinging on still, fused to the nut (the black marks are wear my fingertips have removed the dust):
View attachment 7911575
Others were hanging off Salvador Dali-style (I removed and tossed the remnants) or were gone completely.
Rear wheel indicators are as normal:
View attachment 7911576