From their website...
"With our version, we’ve elected to make a replacement flange for the differential pinions. These flanges are machined from solid billet steel. We do not believe this flange will never break, We designed it to accept standard "off the shelf" mating flanges. If these flanges ever break, you at least stand a chance of getting a replacement part from almost any drive line shop. This also nets a longer drive shaft with the center of the universal joint closer to the pinion bearing.
We can build the either drive shaft in 1310 or 1350 series."
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