They could be ice grouser attachments. I have seen other styles that Cat sold but were a little different than these so these could either be after market or home made, can,t tell too well from the picture, just my guess.
They look like the street pad that have been worn through.
Our channel highlights machines from the earliest Holt and Best track-type tractors, equipment from the start of Caterpillar in 1925, up to units built in the mid-1960s.
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