I don"t have the dimensions but here are the Ferguson part numbers for the venturi and the idle jet for the TSX 458 that is the OEM carb for most of the TO-30 series (some of the late TO-30"s use the Carter carb).
Venturi - 1 751 211 M1
Idle jet - 15 469A
There is no sepparate jet for the power jet for the TSX 458. The Main Nozzle is P/N 1 751 334 M1.
I"d try an AGCO dealer for parts. If not do a google search for TSX 458 carb, etc . I believe the www.carburetorshop.com might also be of some help.