503 97 00-02 is the part number I used and it showed up as good in esales. I ordered a set of these back in December for an Arboristsite member and list price was like $9.25 each. I paid around $7.85.
Like I said, it's been my experience that they don't stay on the crank after being popped off and put back on. I figure $8-9 is well worth avoiding the headache.
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