I just found a worn spacer behind the sprocket of my 2003 4pt!
It is about 4mm thick, the sprocket number is JTF1577-15. According to the JT website it is 9.5mm thick so Plus spacer gives 13.5mm
The replacement part is listed as JTF577-15 (15.65mm thick).
So it looks like there is no spacer needed with the new 577 sprocket.
Hope this helps. and I hope it fits.
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