Trike rear axle with lsd and drum brakes, not sure of the origin of either but could be a west wales trike setup or similar, £350 on Facebook marketplace , ntdwm

https://www.facebook.com/marketplace/item/144804652843840

Edit, looks like they may be mx5 hubs and therefore maybe a Torsen Diff.

[Edited on 23/5/18 by Ugg10]