I agree with you Darrin, this is likely what Arie is asking about.
I have portions of one sample that appears to be factory manufactured with a black colour composite material. No part number found, green colour thread is used. Maybe this explains the replacement "C" series?
CTL 1621. Excluder - leather dust - for cross tube.
When stock depleted supply CTL 1622 C.
Two (2) required, not handed.
Ford Universal Carrier Illustrated Parts Catalogue FUC-03, reissued May, 1944
The same item for any of the Canadian produced series universal carriers using hull/track offset first stage steering. According to multiple previous threads, this gaiter can be used on the LP series.
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There is also the unanswered posting from George for the steering cam assembly cover, under the elusive replacement parts catalogue section heading of: "Rare as Rocking Horse Manure".
See:
http://mapleleafup.net/forums/showthread.php?t=24457