I am trying to find some spare pins for the TRF511 UJs. These are a different size from the 501s and most other tamiya shafts. They are 1.6x10.4mm. I have mangaed to damage mine

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I have searched the web for the number given in the manual (9440664) with the only reference found on the USA Tamiya website.
I can find pleanty of the 501 pins that are 2mm but none that are 1.6mm - HELP!!
If anyone knows where I can get some you would make my day.
Thanks
James