RC30 Rear suspension collars

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Hi

I am refurbishing the linkage on my RC30 and have been unable to find
2 of part no 52453-mr7-000
These are the collars that fit into the spherical bearing in the triangular
casting that forms part of the linkage between the swinging arm and the
shock.
It is unobtainable from Honda and I have tried Dave Silver, John Oldfield, and some parts suppliers in USA.
Can anyone help?

Thanks
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