Can anybody identify these rubber bits I found under my 'Goose - see photos

I found these bits of red rubber under the goose a few days ago...

I have a pretty good idea what it is, but I'm curious as to what others think it came from.

Curved red rubber, quite brittle, piece is about an inch long with an indention near one end.

15514979412278138776628442469067 

20190301_212846

Thanks,
MH

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