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Hesston is an AGCO company. You can use the on line parts book at this link: https://apb.agcocorp.com/
. Click on "view Books" in the Guest User area to get to the book search page. Use 5540 in the model box and search. The 5540 round baler should be in the list that comes up. I see a couple different threader assemblies, you will need to see which matches yours. The motors/actuators do appear. I searched one of them on line by part number and saw several possible sources. You might start with your Hesston/AGCO dealer.