A904 front planetary and washer question

A pic of the exact problem area's would be nice.

Usually the sun gear, planet set and ring gear should all be replaced as a set, but it has been done to replace one piece only of the three wear matched set.
The downside can be early failure of any of the three pieces due to mismatched wear
Other than that they can end up a little "whiney" from that mismatch.

A washer for the same size planetary should be obtainable through most any decent local shop due to them being used in so many transmissions, but you do have to use the one used for your size planetary gear set if I remember correctly.

Also A&A transmission parts online probably has at the very least used ones.
904 planet - A&A Transmissions