LSD Carrier
Barry,
Do you have a digital caliper? If not, get one
You need to measure your housing, cover, inner & outer discs, belleville springs & document it. The stack needs to be built within .1mm to .4mm clearance to work correctly. Any thing larger will slip & burn the clutches up.
It looks like you have purchased two new 2.0MM inner discs. The early carrier will only hold two inner & two outer discs on a side loader. Use to replace your old. No room to machine housing to hold more like later 188mm units. Did your diff have a 4MM spacer in it? if so, you can remove it to add one additional inner & outer discs that measure 4MM combined.
Outer discs are available from Porsche in various sizes to shim up the preload of housing.. BMW does not supply these anymore. I have all the part #s if needed. Also bimmerdiffs.com sells the needed parts.. Replace your 8MM carrier bolts with new 12.9 pieces.
The process is written up in the blue shop binders..25% LSD not 40%
Call if you need help
T