Peugeot is the best place for shims, or a gearbox specialist, Miles at Pugracing may be able to help as he builds a lot of gearboxes over the years, I have a shim kit as I've built a few boxes too.
The shims are more like 1.5 to 2mm or even more but in very small increments, though I've found that more often than not you use the original shim for the casing or input shaft, rarely is there much variation.
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