Do you have the part numbers for the parts you are looking for..?? If not, you can go here:
Welcome to AGCO Parts Books Enter as a guest user, at bottom right. Enter your brand, and model number, and select your model tractor from the menu,and select. You'll then find a listing of parts by function group. Open a selected function group,and a window will open showing an exploded view of said function group, with part name, and part number.
Once you find a proper part number, you can do a Google search, and see if there are any hits. Results will vary from someone actually having that part for sale, to threads from forums like this, searching for the same part. Reading those threads may lead you to a part source.
If no satisfactory results doing that, you can always go to TractorHouse
TractorHouse.com | Used Tractors For Sale: John Deere, Case IH, New Holland, Kubota. and post a "want to buy ad", which is 3rd item down in the red column at top left. You'll need to register, and leave some contact info. Fill out the request, using description,and most important part number. Posting goes out to salvage yards, and individuals who have parts for sale. Response time is at most, 48 hours. Experience has taught me to wait 36-48 hours IF I got a response of apart in stock, as prices, and shipping can vary a lot, on larger parts. And most parts carry a 90 day warranty, but you'll have to check with the seller about that, and I believe all carry a customer satisfaction clause, if you're not satisfied with the condition of said part.
Wit that being said, I've always been well satisfied with the parts I've purchased through here.