Part Number Identification

I have two part numbers I'd like to figure out which tractors they were originally on. They are P/N 4B2957 and 4B3025. The Foley Cat dealer in Wichita was able to identify them as part of a governor control assembly but not which tractor they were on. They are both part of a welded up throttle control assembly on a Diesel 75, but it's not at all like the original throttle control in the parts book. Thanks for any help.

4B2957 is part of a Governor Control Group, on the 2U and 8R, and Governor Changeover Group on the 2T and 5T.
No data on the 4B3025.