Just found the old invoice for the parts I ordered, thought I'd post the part numbers here in case it helps you out with the plunger bearings:
For the four outside ones, I replaced the 3" Allis ones with the 2-1/2" ones that NH uses for many of their square baler models. I used aftermarket ones made by AI that you should be able to get through any dealer. AI Part Number A-688282 (original NH part # is just 688282).
For the two lower and one inside roller, I replaced the 2" Allis ones with a 1 7/8" yoke roller with a 1/2" low-profile shoulder bolt inside. I went with the 1 7/8" rather than 2", because 1 7/8" yoke rollers have a 1/2" bore (which works nicely with the 442 plunger mount holes) whereas 2" yoke rollers have a 5/8" bore. Yoke rollers were McGill #'CCYR 1 7/8 S', which is interchangeable with Smith # 'YR-1-7/8-XC' (a few other companies make yoke rollers that will interchange as well). The ultra-low head shoulder bolts I got to work with the yoke rollers were McMaster Carr # 90969A430.
The plunger crank arm bushings were 1-11/16" O.D. x 1-1/4" I.D. X 2" Long 660 Bronze Bushings. I ordered from a place called 'bronzebushings.com', their part number CB-2027-16. Had to cut them down to 1-3/4" length and do a fair bit of polishing of the bore, as they were a really snug fit on the 1-1/4" plunger shaft.
The reel cam bearings are just 6202 bearings which you can get anywhere. I think I ordered a 10 pack of cheapy ones off Amazon, which did the job just fine. Just make sure you get sealed (not shielded or open-race).
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