Those o-rings will come with the head gasket if you order a top end overhaul kit from your Cat Dealer, it has all the various gaskets and seals needed. The seals are 6B6225, the ferrule are 6B6224, head gasket is 4F2789.
Mike
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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