I'm having a custom made LSD from Gripper (
gripper).
They have all the specs for the W123 280E, as they built a LSD for Owain Lloyd, for his 280CE London to Cape Town rally car.
The only major problem they had during the entire rally was broken steering, which they still managed to fix, and complete the rally.
The LSD is my only big expense on this car(about £1200), everything else I'm doing for pennies, but seeing as I can't find a LSD that's a straight swap I've decided that this is going to be my 1 extravagance on this build.