Thanks for measurements, I will try and get the measurements for the 56 series. Sadly I trashed a the bearing on the mainshaft. Thought I'd come up with a nifty way to press it on by hand but ended up inadvertently putting pressure on the outer bearing race. Fortunately I found a replacement for $15 on Amazon by putting in the Naichi nearing number. There $34 from auto parts places like rock auto.