for the little thrust washers in the diffs you can use yokomo washers. the fit perfect and stay smooth longer than the stock washers. they normally come with bearings in the package too. they also work great. i spilled some of them cleaning and lubing the diff. they are the perfect replacement / upgrade for the diffs. i paid $3 at the LHS. came with 2 washers and about 20 of the smaller bearings. now i am looking for replacements for the larger washer in the diff.
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soon to be
mini cooperS (bmw) mini-x
novak xxl receiver
lrp quantum micro esc
hpi micro mod
5 2/3a zapped cells
novak 10v 4700u power cap
xmod suspension
xmod wheels and tire upgrade