I have for sale a C56 5 Speed Gearbox out of a Blacktop halfcut. The half cut had approximately 80,000km on the clock.
To be honest I am not sure if the gearbox is LSD or a single spinner as I bought it without knowing whether or not it was LSD. So you could be plesantly surprised. I bought the gearbox when it was already taken out of the half cut and have not installed it in my car at all.
Reason for sale is that I have no use for this gearbox as I will probably be going 6 speed.