SP stands for special parts and all wartime production D2's had that designation. Someone said it was special gear ratio in the transmission. (Faster to outrun bullets) Ha Ha
Let us know how you get on with your search. Catalog of 1948 for the 5J3501 up doesn't show any decals or transfers, I suppose they didn't exist at that time, the markings must have been stenciled or something.
Just telephone the ACMOC office, give them the serial number of your tractor, and they will advise you of the price. I'm not aware of any requirement that you be a member of ACMOC to purchase them. Phone number is 309-694-0664, in the USA. GWH
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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