Cheers Pugwash, not that as the flywheel was left in place. UFO picked it, disconnected earth that I thought was dealt with.
Also, I can't remember which linkages were hanging off that gearbox when you took it.
The 306 linkages should be 260.5mm for the long one, and 106mm for the short ones.
The 405 linkages would be 246mm for the long one, and 101.5mm for the short ones.
You will need to use the 306 linkages, regardless of the origin of the gearbox.