I must be having great luck then, most of ours are original, and the ones that arent have been on there since I bought the truck.
I did pull off a roasted CS144 (I think, its quite a bit bigger than stock) of the project 98, had failed in spectacular fashion (black around the plug, possibly spit fire?) IDK what they did, because the bearings were fine.
I converted it back to the stock alt.
The factory original C.W. Niehoff Alternator is finally giving up the ghost on our 1977 Allis Chalmers 7060 farm tractor that is out in the dust and dirt and 100+ degree heat most of its life. Pretty darn impressive IMO.