Forgive my greasy nails!

Okay, so here's the small gear. According to djheptic's diagram, one shim should go where you see it here, so that it sits against the bearing. But, the hard diff gear is different to the pot metal one, so this shim is too wide.



And here's the output gear. I don't know which side the shim should go on - is it this side...(where the red dot is)
(You can also see the pot metal small gear in this image)



Or this side? (where the red dot is marked)...(Will one shim do? Or should I use two?)