Bad news. The pinion I have has the 568 bearing on it, which was only used on the 158 504 AS bull pinion. Not what you need. The shaft diameter where the bearing sits measures over 2 7/8, more like 2 29/32 on mine. According to what I can find on the internet, the 5760 bearing has a 3 inch ID, sure you measured correctly?

Check out this link for a handy list of bearings and their sizes.
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I didn't even look at the ring gear (bevel drive gear) to see what part number it has. Sorry I couldn't help out more.