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I do a similar mod but use two NU 1010 roller bearings, machining required, one good thing is the old axle tube bearing area only has to go down to 50mm .
machine the hub bearing area true, press in a sleeve ,then machine to 80mm
Have done two ,
the roller bearings take WAY more load than a ball bearing, the 2 NU 1010 take a static load of 9500 KGs per side so they will handle 19 tones on the back end .
Also the speed of the rollers is way slower than a needle roller.
BUT they are costly.
I have a set on my bench now so will post some pics, or look up a post I did way back on them .
Lawrie