WOW that real is definitive! Can't thank you enough.
I emailed synchrotech trans who is USA dealer.
https://shop.synchrotech-transmissio...TRS-10E90A.htm
I measured it's 90mm seal OD.
So I can use a 188k or l lsd is interchange but not bearings.
Model 188K/L
Axle seal bore measures 90mm
*188K*
6 cyl cars up to 2006
uses taper roller bearings
E46
Z3?
5-series?
*188L*
6cyl N/A cars from 2006
uses ball bearings
E8x, E9x
ie: 128i, 130i, 328i, 330i
*early 135i automatic models