You didn't say what width you have, so got you to the page, that has 3 selections @ New Holland online parts book.
Official New Holland Online Parts Store and Online Parts Catalog for New Holland and Ford Tractors. Bearings, and knives may be the same for all. Just choose the one you have, and select in the list. Once you find the part you are looking for, select it in the list. Another page will appear, with the part number. Copy, and paste that part number to a search engine. I have the best luck using Google. Got a lot of hits for the knives, even on Amazon.com. Through New Holland, knives are like $9.42 ea. Saw a set of 20 on Amazon for around $94.00. TISCO has them for $5+ change ea.
If you want to do some price comparison, as mentioned, go to Messicks. When you enter the part number, it will give the price. Usually good at any NH dealer in the lower 48.
As far as the bearing number, you may be able to cross it, to get the part number, by going through NAPA:
NAPA Auto Parts - Buy Car & Truck Parts Online | Auto Supply Stores Near Me You'll probably have to select "interchange", if nothing appears. If it does happen to come up there, it should give the bearing number in the description. Copy and paste that to Google, and you can compare pricing. In some instances, I have even searched ebay, and found NOS bearings real cheap.