Diff shims on X4/te

[Dandare]

Reading about having extra shims for the diffs ie, on the rear driveshaft outdrives which I believe are part No. 125000958 (TR4057)

Is it ever necessary to fine adjust the centre driveshaft(prop) with extra shims ?

If so there is a discrepancy between part No's ie, the manual states these shims are part No. 125000479 (T02081) 5.1x8x0.2 The conversion chart I have (off Oople) states these measure 3x7x0.8 which seem quite thick for fine adjustments to diff gear meshing.

Does anyone know if a) I need (or may need) to shim the centre driveshaft gear, & what size they actually are, or b) whether I just need (or may need, lol) extra rear driveshaft outdrive shims only ?

Thanks.